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Gekata [30.6K]
3 years ago
8

A solution is prepared by dissolving 76.3 g NaI in 545 g of water. Determine the mole fraction of NaI if the final volume of the

solution is 576 mL.
Chemistry
1 answer:
likoan [24]3 years ago
7 0

Answer:

Mole fraction NaI → 0.016

Explanation:

Mass of solute: 76.3 g (NaI)

Mass of solvent: 545 g (H₂O)

Let's determine the moles of each:

Mol of solute → 76.3 g . 1 mol/ 149.89 g = 0.509 moles

Mol of solvent →  545 g . 1mol/ 18 g = 30.2 moles

To calculate the mole fraction → Moles of solute / Total moles

Total moles = 0.509 + 30.2 → 30.709

Mole fraction NaI = 0.509 / 30.709 = 0.016

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Equal volumes of SO2(g) and O2(g) at STP contain the same number of
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Answer:

Equal volumes of SO2(g) and O2(g) at STP contain the same number of molecules

Explanation:

According to Avogadro Law,

Equal volume of all the gases at same temperature and pressure have equal number of molecules.

This law state that volume and number of moles of gas have direct relation.

When the amount of gas increases its volume will increase and when the amount of gas decreases its volume will decrease.

Mathematical relation:

V ∝ n

V/n = K

K is proportionality constant.

When number of moles change from n₁ to n₂ and volume from V₁ to V₂

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V₁/n₁ = K     ,     V₂/n₂ = K

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Question 1 (4 points)
oee [108]

▪▪▪▪▪▪▪▪▪▪▪▪▪  {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪

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2 years ago
A brick has a mass of 4.0 kg and the Earth has a mass of 6.0 × 1027 g. Use this information to answer the questions below. Be su
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Answer:

a) 2.4\times 10^{24} kg is the mass of 1 mole of bricks.

b) 2.5\times 10^3 moles of bricks have a mass equal to the mass of the Earth.

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Mass of N_A bricks :

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b)

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Mass of 1 mole of brick = m=2.4\times 10^{24} kg

Let the moles of brick with equal mass of the Earth be x.

m\times x=M

x=\frac{M}{m}=\frac{6.0\times 10^{27}kg}{2.4\times 10^{24} kg}=2.5\times 10^3

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