which property does hydrogen have that it is used in filling balloons?
​

The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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Answer:

\(W=-6.99kJ\)

Explanation:

Hello,

In this case, since the work at constant pressure is computed via:

\(W=P\Delta V=P(V_2-V_1)\)

For an initial volume of 99.0 L and a final one of 98.0 L, accounting for a compression process at a pressure of 69.0 atm, we obtain a negative work, meaning that work is done on the gas, according to the first law of thermodynamics:

\(W=69.0atm(98.0L-99.0L)\\\\W=-69atm*L\)

However, the work in kJ with three significant figures because the initial data have all three significant figures, is:

\(W=-69.0atm*L*\frac{101.325kPa}{1atm}*\frac{1m^3}{1000L} \\\\W=-6.99kJ\)

Best regards.

Explanation:

The viscosity of the liquid has been used to evaluate its resistance to flow. Air, gasoline, as well as other fluids that move quickly, are of low viscosity. The particles throughout the liquid are covered by other particles and drawn uniformly in both directions by cohesive forces inside the liquid.

Sample response:  Viscosity refers to a liquid’s resistance to flow. Liquids with a higher viscosity flow more slowly. In liquids that are more viscous, there is a stronger attraction between atoms.

your welcome ;)

Answer:

60 g/ mol

Explanation:

Carbon, C 12

Hydrogen, H 1

Oxygen, O 16

Molar mass = 12+3+12+16+16+1 = 60 g/ mol

Answer:

Usually involves the removal of

vegetative or non-endospore forming pathogens.

Explanation:

Usually involves the removal of

vegetative or non-endospore forming pathogens.

To calculate the moles of H+ and OH-, you need to know the concentration of the solution in terms of its pH or pOH value.

When you get the pH of the solution, you can use this formula to calculate the concentration of H+ ions: [H+] = 10^(-pH)

Also, if you know the pOH of the solution, you can use this formula to calculate the concentration of OH- ions: [OH-] = 10^(-pOH)

Having determined the concentration of H+ and OH- ions, the molarity formula can be used to calculate the number of moles of each ion as follows: moles = concentration (in mol/L) x volume (in L)

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Answer:

Ti

Explanation:

We have that  he element X is

X= Titanium

From the question we are told that

XCl4 contains 74.8% Cl by mass

Hence for a 100g

Cl=74.8g

Mole of Cl=\frac{74.8}{35.5}

Mole of Cl=2.1

Meanin that 4 M of Cl=1 M of X

Generally the equation for the moles   is mathematically given as

moles = \frac{mass}{ molar mass}

Where

mass of X=100-74,8=25.3

and

moles of X=\frac{2.1}{4}

moles of X=0.527

0.527= \frac{25.2}{ molar mass}

molar mass=47.8g

Therefore

Element with molar mass=47.8g is Titanium

Hence

X= Titanium

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The value of S2 is S₂ = 2.1 g/L.Approximately 2.1 g of the gas will dissolve in 2 L of water at 0.6 ATM, assuming the temperature remains constant.

To determine the amount of gas that will dissolve in 2 L of water at 0.6 ATM, we can use Henry's law, which states that the solubility of a gas is directly proportional to the partial pressure of the gas above the liquid.

According to Henry's law, the solubility of a gas can be represented as:S₁/P₁ = S₂/P₂,,where S₁ and S₂ are the solubilities of the gas at the respective pressures P₁ and P₂.Given that 7 g of the gas dissolves in 1 L of water at 2.0 ATM, we can consider this as our initial condition, denoted by S₁/P₁.

Now, we need to find the solubility at 0.6 ATM in 2 L of water, denoted by S₂/P₂.Since the temperature remains constant, we can assume that the solubility of the gas does not change. Therefore, we can rewrite the equation as:

S₁/P₁ = S₂/P₂,

Substituting the known values, we have:

(7 g/1 L)/(2.0 ATM) = S₂/(0.6 ATM),

Solving for S₂, we get:

S₂ = (7 g/1 L) * (0.6 ATM)/(2.0 ATM),

S₂ = 2.1 g/L.

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When NaCl are dissolved in water, the freezing point is found to be - 0.26°C. The molarity for this solution is 0.02 mol.

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.

The molality is defined as the number of moles of solute, which in your case is sodium chloride,

NaCl, present in one kilogram of solvent, which is water.

To find the number of moles of sodium chloride present in sample, use the compound's molar mass25g⋅

1 mole NaCl58.44g

=0.428 moles NaCl

Then, you know that you're dissolving in many moles of sodium chloride in 20 kg of water.

thus, use the composition of this solution to find the number of moles of solute present in 1 kg of water

1kg water⋅0.428 moles NaCl20kg water

=0.0214 moles NaCl

= 0.02 mol

Thus, The molarity for this solution is 0.02 mol.

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Answer: Yo! hope this helps you dude

When ice is placed into a beaker filled with water, the water level does not drop because of the concept of displacement. When the ice is added, it displaces an amount of water equal to its own volume. This means that the ice takes up space in the beaker, pushing out an equal amount of water to make room for itself. Therefore, the total volume of water and ice in the beaker remains the same, and the water level does not drop.

This is due to the fact that the density of ice is lower than that of water and when the ice is placed into the water, it will float on the surface, pushing out an amount of water equal to its own volume.

Additionally, when the ice melts, it will release the same amount of water it displaced before and the water level will not change.

Explanation:

If an equation includes 7(CrO₄)₂, the numbers of Cr's and O's atoms that are there are 14 and 56 respectively.

The number of atoms present in a chemical compound can be calculated by multiplying the subscript of the particular element by any coefficient.

According to this question, 7 moles of chromate with the chemical formula; (CrO₄)₂ is given. The number of oxygen and chromium atoms in this compound can be calculated as follows:

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The balanced redox reaction in the chemical reaction is given below:

40H2S + 48H+ + 16MnO4¯ ---> 5S8 + 16Mn2+ + 64H2O

Balancing the redox reaction:

Solution:

1) Half-reactions:

H2S ---> S8

MnO4¯ ---> Mn2+

2) Balance:

8H2S ---> S8 + 16H+ + 16e¯

5e¯ + 8H+ + MnO4¯ ---> Mn2+ + 4H2O

3) Make the number of electrons equal (note that there are no common factors between 5 and 16 except 1):

40H2S ---> 5S8 + 80H+ + 80e¯ <--- factor of 5

80e¯ + 128H+ + 16MnO4¯ ---> 16Mn2+ + 64H2O <---

factor of 16

4) Thus, the final answer is given below;

40H2S + 48H+ + 16MnO4¯ ---> 5S8 + 16Mn2+ + 64H2O

Oxidation-reduction can simply be defined as a special type of chemical reaction in which the oxidation states of the substrate change.

So therefore, the balanced redox reaction in the chemical reaction is given below:

40H2S + 48H+ + 16MnO4¯ ---> 5S8 + 16Mn2+ + 64H2O

Complete question:

Balance the following redox reaction:

MnO4¯ + H2S ---> Mn2+ + S8

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There are 0.25 moles of HCl present in 250 mL of 1.0 M HCl.

We have to calculate the number of moles of HCl present in some mL of 1.0M HCl.  A mole is defined as the amount of substance in a system that contains as many elementary entities as there are atoms in 0.012 kg of carbon 12. We represent mole by the symbol 'mol'. Now, we will see how to calculate the number of moles.

We can calculate the number of moles of a substance using the following expression;

Molarity = no of moles of an element/volume

According to this question, we were given 250. mL of 1.0 M HCl. The number of moles will be calculated by the formula as follows;

no of moles of HCl = 0.250L × 1.0M

no of moles of HCl = 0.250 moles.

Therefore, 0.25 moles are present in 250 mL of 1.0 M HCl.

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Answer:

Repeated SN2 reactions occur leading to the formation of a racemic mixture

Explanation:

S-2-iodooctane is a chiral alkyl halide with an asymmetric carbon atom. The presence of an asymmetric carbon atom implies that it can rotate plane polarized light and thus lead to optical isomerism. The two configurations of the compound are R/S according to the Cahn-Prelong-Ingold system.

However, when S-2-iodooctane is treated with sodium iodide in acetone, repeated SN2 reactions occur since the iodide ion is both a good nucleophile and a good leaving group. Hence a racemic modification is formed in the system with time hence we end up with (±)- Iodooctane.

Answer: Some reptiles, amphibians , fish and invertebrates carry their developing young inside them.

Explanation: Some of them :)

The formal Positive sign convention for, work done by the system and heat transfer into the system. The Negative sign convention for heat transfer out of the system and work done to the system.

Thermodynamics is a special branch of chemistry that deals with concepts of heat, temperature and work and interconversion of heat into other forms of energy. Sign convention for heat : Heat transfer into the system is positive and heat transfer from the system is negative. In other words, all heat exchanges that increase the energy of a system are positive and all heat exchanges that decrease the energy of a system are negative. Sign rule for work :

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Complete question:

Following the formal sign convention, please match the heat and work interactions with their appropriate signs:Positive or Negative

1) work done by the system

2) heat transfer into the system

3) heat transfer out of the system

4) work done to the system

The statement that is true regarding the solution prepared by adding 0.10 mol of potassium acetate to 1.00 L of water is that it is acidic (option B).

pH refers to the measure of the acidity or alkalinity of a solution. It can be calculated by using the following expression:

pH = - log {H}

Where;

The concentration of the acetate solution must first be calculated by dividing the number of moles by its volume as follows:

Molarity = no of moles ÷ volume

Molarity = 0.10 mol ÷ 1L = 0.1M

pH = - log {0.1}

pH = 1

1 indicates that the solution is acidic, hence, option B is correct.

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Oxygen and Hydrogen atoms bond to form water - COVALENT BOND

Sodium and chlorines bond to form table salt - IONIC BOND

A covalent bond is a chemical bond in which pairs of electrons are shared between two atoms. Example of compounds that possesses covalent bond includes water (H2O), methane (CH4), etc...

From the water molecule shown in the diagram, you can see that oxygen has 6 valence electrons in its outermost shell while the hydrogen atom has 2 electrons each in its outermost shell. Since oxygen needs 2 electrons to complete its outermost shell (octet rule)l, it will have to share the two electrons from the hydrogen to form a covalent bond with the hydrogen atoms.

In contrast, ionic bonding is the type of bonding that occurs between a metal and a non-metal. In ionic bonding, the metal donates (donor) its lone electron to the non-metal (acceptor) to form a negative ion

For instance, sodium chloride (NaCl) is a typical ionic bonding whereby the sodium atom loses its electrons to form a +1 ion while chlorine gains the lone electron to form a negative (-1) ion.

The Correct electron configuration of carbon as 1s² 2s² 2p². Option B.

To understand why this is the correct electron configuration, let's break it down step by step:

The atomic number of carbon is 6, which means it has six electrons. Electrons are distributed in energy levels or shells around the nucleus.

The first shell, known as the 1s orbital, can hold a maximum of 2 electrons. Therefore, the first part of the electron configuration is 1s², indicating that two electrons occupy the 1s orbital.

The second shell has two subshells: the 2s orbital and the 2p orbital. The 2s orbital can hold a maximum of 2 electrons, while the 2p orbital can hold a maximum of 6 electrons. In the case of carbon, after the 1s orbital, two more electrons occupy the 2s orbital. So far, we have 1s² 2s².

The remaining two electrons in carbon are placed in the 2p orbital. The 2p orbital consists of three separate p orbitals: 2px, 2py, and 2pz. Each p orbital can hold a maximum of 2 electrons. Therefore, the last part of the electron configuration for carbon is 2p², indicating that two electrons occupy the 2px and 2py orbitals. Option B is correct.

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The measurement can be reported with three significant figures as follows: 3.90 mm.

The measurement can be reported with three significant figures as 3.90 mm. The record is a reading from a ruler that shows the specific point where the red line meets and the exact measurement is in three significant figures because none of them can be disregarded.

So, the accurate reading is 3.90. When the accurate reading is used, it ensures that the result of the measurement will be as expected.

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Answer:

H2O2

Explanation:

By numbering the atoms we know about that it’s Hydrogen Peroxide

Answer:

Explanation:

2. Our cells produce a lot of waste that must be eliminated (excreted) from the body. These residues are called excreta. The residues formed from the chemical reactions that take place inside the cells can be eliminated through:

• of the respiratory system (carbon dioxide)

• skin (sweat)

urinary system (urine)

Our cells expel these substances to maintain the dynamic balance (homeostasis) of our body and promote our well-being.

A is the answer

In an ozone molecule, the three atoms must be connected, so there must at least be a single bond between them. Place

dots in pairs around the oxygen atoms until each oxygen atom has eight valence electrons, starting with the atoms on the

outside and doing the central atom last if there are enough. Do not exceed the total number of valence electrons

identified in part A. Remember that the dashes between the oxygen atoms, which represent single bonds, each indicate

the presence of two valence electrons

Answer:

Explanation: i did it

Answer:

2-5

Explanation:

I just did it.

The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂

An oxidation number is a number assigned to atoms in molecules to show the general distribution of the electrons.

Oxidation state or number helps us describe the transfer of electrons.

The oxidation number/state is also used to determine the changes that occur in redox reactions.

Overall, the oxidation number of an atom in a molecule is the charge that the atom would have if all polar covalent and ionic bonds resulted in a complete transfer of electrons from the less electronegative atom to the more electronegative one.

Therefore, The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂

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