3 chemistry assignments due in 48 hours

Percent Composition Practice Problems

Print out or hand write each the the problems below, leaving adequate space between each problem. Show all problem-solving steps for each problem below, as demonstrated in the lesson. Create a single file by copying and pasting a picture of the problem-solving steps under each problem. Upload the document.

1) Determine the percentage composition of ethanol (C2H5OH).

2) Determine the % by mass of each element in calcium chloride.

3) Calculate the percent composition of sodium sulfate.

4) Which has the larger percent by mass of sulfur, H2SO3 or H2S2O8?

5) What is the percent composition of phosphoric acid (H3PO4)?