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3 years ago

The action of some commercial drain cleaners is based on the following reaction:

Chemistry

1 answer:

zvonat [6]3 years ago

5 0

Answer:

The volume of H₂ gas formed: V= 7.87 L

Explanation:

Given reaction: 2 NaOH(s) + 2 Al(s) + 6 H₂O(l) → 2 NaAl(OH)₄(s) + 3 H₂(g)

In the given reaction, number of moles of Al = 1, number of moles of H₂= 3

Given mass of Al = 6.32 g, atomic mass of Al = 26.98 g/mol, atomic mass of H₂ gas = 2.015 g/mol

∴ Number of moles of Al = given mass ÷ atomic mass = 6.32 g ÷ 26.98 g/mol = 0.234 mol

In the given reaction, 3 moles hydrogen gas (H₂) is obtained when 2 moles aluminum (Al) reacts with excess sodium hydroxide (NaOH)

Therefore, number of moles of hydrogen gas (H₂) obtained when 0.234 mol Al reacts with excess NaOH = 0.234 mol × 3 mol ÷ 2 mol = 0.351 mol

Given: Standard temperature: T = 273.15 K, Standard pressure: P = 1 atm,

Number of moles of H₂ gas: n = 0.351 mol, gas constant: R = 0.08206 L·atm/(mol·K)

Volume of H₂ gas: V = ?

According to the ideal gas equation: P·V= n·R·T

⇒ V= n·R·T ÷ P

⇒ V= (0.351 mol) × (0.08206 L·atm/(mol·K)) × (273.15 K) ÷ (1 atm)

⇒ V= 7.87 L

Therefore, the volume of H₂ gas formed: V= 7.87 L

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D. The stronger the forces, the more heat that must be added to boil

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Explanation:

The intermolecular forces hold the molecules together and so require energy to break them. When a substance changes states, it's not the atoms that separate from other atoms, it's molecules separating from molecules. The stronger the intermolecular forces, the more energy is required to break the intermolecular forces

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3 years ago

In which of the following sets do all species have the same number of protons?

Ipatiy [6.2K]

Among the given options, Option (D) that is O, $O^2^-,O^2^+$ will have the same number of protons. Hence option (D) is correct.

<h3>What are protons ?</h3>

A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron.

In option (D), All the three species (O, $O^2^-,O^2^+$ ) bears 8 protons but the number of electrons varies.

In any Ion, there will be no change in number of protons among the same atoms but number of electrons varies.

Therefore, Option (D) has same atoms but different ions.

Hence, it has same number of protons. Thus the correct answer is option (D)

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2 years ago

What atomic or hybrid orbitals make up the sigma bond between br and f in bromine trifluoride, brf3?

mina [271]

Draw the Lewis structure. Bromine has 3 bonds and two lone pairs for a trigonal bipyramidal electron geometry and an sp^3d hybridization. Fluorine is peripheral it does not require hybridization, but we often consider it to be hybridized too - it has 1 bond and 3 lone pairs for sp^3 hybridization. So the sigma bonds come from an overlap of an sp^3d orbital on Br with an sp^3 orbital on F. If you don't consider the F to be hybridized the overlap would have to be to a p orbital on the F

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4 years ago

F light waves change speed as they pass from one medium into another at an angle, the light will be ____.

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3 years ago

A 2.300×10−2 m solution of nacl in water is at 20.0∘c. the sample was created by dissolving a sample of nacl in water and then b

lilavasa [31]

The given question is incomplete. The complete question is as follows.

A 2.300×10−2 m solution of nacl in water is at 20.0∘c. the sample was created by dissolving a sample of nacl in water and then bringing the volume up to 1.000 l. it was determined that the volume of water needed to do this was 999.4 ml . the density of water at 20.0∘c is 0.9982 g/ml.

Calculate the molality of the salt solution.

Express your answer to four significant figures and include the appropriate units.

Explanation:

Molality is defined as the number of moles present in kg of a solvent.

Mathematically, Molality = $\frac{\text{moles of solute}}{\text{mass of solvent}}$

Also,

Mole of solute = Molarity of solute x Volume of solution

= (0.0230 M) x (1.000 L) = 0.0230 mol of solute

Therefore, mass of solvent will be as follows.

$999.4 mL \times (\frac{0.9983 g}{1 mL})$

= 997.7 g

= 0.9977 kg (as 1 kg = 1000 g)

Therefore, we will calculate the molality as follows.

Molality = $\frac{0.0230 mol}{0.9977 kg}$

= 0.02306 mol/kg

thus, we can conclude that molality of the given solution is 0.02306 mol/kg.

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3 years ago