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frez [133]
3 years ago
9

41. A 13.0% solution of K2CO3 by mass has a density of 1.09 g/cm3. Calculate the molality of the solution.

Chemistry
1 answer:
PIT_PIT [208]3 years ago
5 0

Answer:

1.08 m is the molality of the solution.

Explanation:

1st step: Determine the mass of solvent.

13% by mass means that 13 g are contained in 100 g of solution.

Solution mass = Solute mass + solvent mass

100 g = 13 g + Solvent mass

Solvent mass = 100 g - 13 g → 87 g

Second Step: Let's determine the moles of our solute mass (mass / molar mass)

13 g / 138.2 g/mol = 0.094 moles

Third step: Replace the data to determine molality.

Molality are the moles of solute in 1kg of solvent (mol/kg)

Before this, we must convert the solvent mass to kg

87 g . 1kg / 1000 g = 0.087 kg

molality → 0.094 mol / 0.087 kg = 1.08 m

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Answer:

Part 1: C₉H₂₀ (l) + 14O₂ (g) ----> 9CO₂ (g) + 10H₂0 (g)

Part 2: Volume of CO₂ produced = 1223.21 L

<em>Note: the complete second part of the question is given below:</em>

<em>2. Suppose 0.470 kg of nonane are burned in air at a pressure of exactly 1 atm and a temperature of 17.0 °C. Calculate the volume of carbon dioxide gas that is produced. Round your answer to 3 significant digits.</em>

Explanation:

Part 1: Balanced chemical equation

C₉H₂₀ (l) + 14O₂ (g) ----> 9CO₂ (g) + 10H₂0 (g)

Part 2: volume of carbon dioxide produced

From the equation of the reaction;

At s.t.p., I mole of  C₉H₂₀ reacts with 14 moles of O₂ to produce 9 moles of CO₂

molar mass of  C₉H₂₀  = 128g/mol: molar mass of CO₂ = 44 g/mol, molar volume of gas at s.t.p. = 22.4 L

Therefore, 128 g of C₉H₂₀ produces 14 * 22.4 L of CO₂ i.e. 313.6 L of CO₂.

O.470 Kg  of nonane = 470 g of nonane

470 g of C₉H₂₀ will produce 470 * (313.6/128) L of CO₂ = 1151.50 L of CO₂

Volume of CO₂ gas produced at 1 atm and 17 °C;

Using P₁V₁/T₁ = P₂V₂/T₂

V₂ = P₁V₁T₂/P₂T₁

where P₁ = 1 atm, V₁ = 1151.50 L, T₁ = 273 K, P₂ = 1 atm, T₂ = 17 + 273 = 290 K

Substituting the values; V₂ = (1 * 1151.5 * 290)/(1 * 273)

Therefore volume of CO₂ produced, V₂ = 1223.21 L of CO₂

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Answer:

Radiation is being released from the reactor.

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<h3>What is radiation weighting factor?</h3>

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