Module 1

Select all the items below which are pure substances

How many millilitres is 0.005 L?

Radio waves travel at the speed of light. How many kilometres will radio waves travel in one year?

What is the formula for strontium phosphate?

What is the mass of 0.0250 mol P2O5?

To the nearest hundredth of a percent, the mass percent of chromium in aluminum dichromate is?

Methyl benzoate is commonly used in perfumes. It has mass percentages of 70.56% carbon, 5.934% hydrogen and the rest is oxygen. Determine the empirical and molecular formulas for methyl benzoate if it has a molar mass of 136.16 g/mol.