10 points What is the percent yield if the theoretical yield was 28.75 g and the actual yield was 26.98 g?

10 points What is the molecular formula if the empirical formula is CHCIO and the molecular weight is 128.94 g/mol?

20 points What is the molecular formula of a compound that contains 23.3% magnesiu 30.7% sulfur and 46.0% oxygen and has a molecular mass of 104.362 g/mol?​