What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O?













2. A solution is made by adding 1.23 moles of KCl to 1000.0 g of water. What is the % by mass of KCl in this solution?













3. If you have 100.0 mL of a 25% aqueous solution of ethanol, what volumes of ethanol and water are in the solution?















4. What is the percent by volume of isopropyl alcohol in a solution that contains 24 mL of isopropyl alcohol in 1.1 L of water?



















5. What is the Molarity of an aqueous solution containing 160.0 g of ammonium nitrate (NH4NO3) in 2500 m L of solution?











6. What is the Molarity of a bleach solution containing 11.7 g of NaOCl per liter of bleach?















7. Calculate the Molarity of 2.30 L of a solution containing 2.45 g of dissolved KBr.















8. How many moles of solute are contained in 15.25 mL of 2.10 M CaCl2?

















9. How many grams of KOH are in 64.3 mL of a 0.0238M KOH solution?















10. What volume of a 3.00M KI stock solution would you use to make 0.300 L of a 1.25M KI solution?



















11. What is the Molality of a solution containing 25.0 g H2SO4 dissolved in 80.0 g of water?

See your post above.

To find the percent by mass of a solute in a solution, you need to divide the mass of the solute by the total mass of the solution and then multiply by 100.

For example, in question 1, to find the percent by mass of NaCl in the solution:
1. Add the mass of NaCl (3.55 g) and the mass of H2O (88 g) to get the total mass of the solution.
2. Divide the mass of NaCl by the total mass of the solution.
3. Multiply the result by 100 to get the percent by mass.

For question 2, to find the percent by mass of KCl:
1. Convert the moles of KCl to grams by multiplying the number of moles (1.23 moles) by the molar mass of KCl.
2. Add the mass of KCl to the mass of water.
3. Divide the mass of KCl by the total mass of the solution.
4. Multiply the result by 100 to get the percent by mass.

For question 3, to find the volumes of ethanol and water in the solution:
1. Convert the volume of the solution to liters by dividing by 1000.
2. Multiply the volume of the solution by the percent concentration of ethanol (25%) to get the volume of ethanol.
3. Subtract the volume of ethanol from the total volume of the solution to get the volume of water.

For question 4, to find the percent by volume of isopropyl alcohol:
1. Convert the volume of isopropyl alcohol to liters.
2. Add the volume of isopropyl alcohol to the volume of water to get the total volume of the solution.
3. Divide the volume of isopropyl alcohol by the total volume of the solution.
4. Multiply the result by 100 to get the percent by volume.

For question 5, to find the Molarity of the solution:
1. Convert the mass of ammonium nitrate to moles by dividing by the molar mass.
2. Convert the volume of the solution to liters by dividing by 1000.
3. Divide the number of moles of ammonium nitrate by the volume of the solution in liters to get the Molarity.

For question 6, to find the Molarity of the bleach solution:
1. Convert the mass of NaOCl to moles by dividing by the molar mass.
2. Divide the number of moles by the volume of bleach in liters to get the Molarity.

For question 7, to calculate the Molarity:
1. Convert the mass of dissolved KBr to moles by dividing by the molar mass.
2. Divide the number of moles by the volume of the solution in liters to get the Molarity.

For question 8, to find the moles of solute:
1. Multiply the volume of the solution in liters (convert from mL by dividing by 1000) by the Molarity to get the moles of solute.

For question 9, to find the grams of KOH:
1. Convert the volume of the solution to liters by dividing by 1000.
2. Multiply the volume of the solution in liters by the Molarity to get the moles of KOH.
3. Multiply the moles of KOH by the molar mass to get the grams of KOH.

For question 10, to find the volume of the stock solution:
1. Use the ratio of the Molarities to find the volume needed for the desired concentration.
2. Divide the desired Molarity by the stock Molarity to get the volume ratio.
3. Multiply the ratio by the desired volume of the solution to get the volume of the stock solution.

For question 11, to find the Molality:
1. Convert the mass of H2SO4 to moles by dividing by the molar mass.
2. Convert the mass of water to moles by dividing by the molar mass.
3. Divide the number of moles of H2SO4 by the mass of water in kilograms to get the Molality.