Answer to Question #181296 in General Chemistry for Joshua

Question

Solve the following word problems using the given handouts.

1) What is the percentage by mass of a 250 grams salt dissolved in 750 grams of water?

2) What is the percent by volume of ethanol (ethyl alcohol) C2H6OH in the final solution when 85ml of ethanolis diluted toa volume of 250 ml water?

3) A brine solution contains 0.90 moles of NaCI per liter of solution.Find its molarity (M) if the volumeis 5 liters?

4) How many grams of Kl must be dissolved in 500g of water to produce a 0.060 molal KI solution?

5) Calculate the mole fraction of the solute in 100g C2H6O in 100g H2O ( water)

Answer 1

1.$=\frac {250}{1000}×100 =25\%$

2.$35\% Ethanol$

3.$0.75M$

4.$4.98g$

5.$\frac {9}{32}$