Calculate the mass of solute and water

Reference no: EM13151165

Compute the mass of solute and water needed to prepare the following solutions: 1. 150 g of 1.00 m (NH4)2SO4: (a) from pure solid (NH4)2SO4 (b) from solid (NH4)2SO4 with a purity of 87.2 wt-% 2. 1.50 L of a 20 wt-% Pb(NO3)2 solution whose density is 1.20 g/mL (a) from pure solid Pb(NO3)2 (b) from solid Pb(NO3)2 with a purity of 98.9 wt-% This is the work I've done so far (please check): 1. a) Molality = (moles of solute) / (kilograms of solvent) moles of (NH4)2SO4 = 150 g (NH4)2SO4 × (1 kg)/(1000 g) × (1.00 mol (NH4)2SO4) / (1 kg (NH4)2SO4) =0.15 mol (NH4)2SO4 mass of (NH4)2SO4 = 0.15 mol (NH4)2SO4 × (132.14 g (NH4)2SO4) / (1 mol (NH4)2SO4) = 19.8 g (NH4)2SO4 mass of solution = mass of solute + mass of solvent mass of H2O = 150 g soln - 19.8 g (NH4)2SO4 = 130.2 g H2O (b) Mass % of component = (mass of component in soln) / (total mass of soln) × 100 mass of (NH4)2SO4 = (19.8 g (NH4)2SO4) / 0.872 = 22.7 g impure (NH4)2SO4 2. a) total mass of Pb(NO3)2 = (1.20 g Pb(NO3)2) / (mL Pb(NO3)2) × (1000 mL)/(1 L) × 1.50 L soln = 1800 g Pb(NO3)2 Mass % of component = (mass of component in soln) / (total mass of soln) × 100 mass of Pb(NO3)2 = 0.20 × 1800 g Pb(NO3)2 = 360.g Pb(NO3)2 How do I determine the mass of water for this question? (b) Mass % of component = (mass of component in soln) / (total mass of soln) × 100 mass of Pb(NO3)2 = (360.g Pb(NO3)2) / 0.989 = 364.0 g impure Pb(NO3)2 How do I determine the mass of water for this question?

Reference no: EM13151165

Questions Cloud

What is the cross price elasticity of the demand for apple : Using the midpoint method, what is the cross price elasticity of the demand for apple juice with regard to the price of orange juice

What percentage of normal adults considered to have fever : What percentage of normal and healthly adults would be considered to have a fever? Does this percentage suggest that a cutoff of 100.6 F is approproate?

How many moles of cl- are in the new solution : When 30 mL of a 365 mL stock solution containing 1.8999999999999997 M AlCl3 is diluted to 81 mL, how many moles of Cl- are in the new solution?

Determining weighted average number of shares : Compute the weighted average number of shares to be used in computing earnings per share for 2007.

Calculate the mass of solute and water : Compute the mass of solute and water needed to prepare the following solutions: 1. 150 g of 1.00 m (NH4)2SO4: (a) from pure solid (NH4)2SO4 (b) from solid (NH4)2SO4 with a purity of 87.2 wt-% 2. 1.50 L of a 20 wt-% Pb(NO3)2 solution whose density ..

What is the elasticity of this curve over range provided : After looking at some reports, you come to the conclusion that when price is 2, quantity is 1, and when price is 6 quantity is 9. Using the midpoint formula, what is the elasticity of this curve over the range provided. a. 5/8 b. 5/4 c. 8/5 d. 2 ..

What is the minimum amount of 6.0 m h2so4 neccessary : what is the minimum amount of 6.0 M H2SO4 neccessary to produce 23.5 g of H2(g) according to the following reaction? 2Al(s) +3H2SO4(aq) --> Al2(SO4)3(aq) + 3H2(g)

Recommendation that maximizes profits and minimizes loss : Explain why you are making the recommendation and you must include a recommendation that maximizes profits and a recommendation that minimizes loss.

Elasticity of demand for stock : Price elasticity of demand for stock is 1.5. This means that foe every 10% increase in stock prices, the quantity demanded will decline by 15 %. Does this make sense? explain.

User Account

All Pages