What is the empirical formula of the following compounds? a. a liquid containing 2.0g of hydrogen, 32.1g sulfur and 64.0g oxygen. b. a white solid containing 4.0g calcium,3.2g oxygen,0.2g hydrogen. c.a white solid containing 0.243g magnesium and 0.71g chlorine。 2. 3.888g magnesium ribbon was burnt completely in air and 6.488g of magnesium oxide was produced. a. how many moles of magnesium and oxygen are present in 6.488g of magnesium oxide ? b. what is the empirical formula of magnesium oxide? 3.Mr for enthane-1,2-diol is 62.0. It is composed of carbon, hydrogen and oxygen in the ratio by moles of 1:3:1. What is its molecular formula. 4.An organic compound containing only carbon, hydrogen and oxygen was found to have 62.07% carbon and 10.33% hydrogen.What is it’s molecular formula if Mr = 58.0? 5.A sample of benzene of mass 7.8g contains 7.2g of carbon and 0.6g of hydrogen. If Mr=78, work out: The empirical formula b. The molecular formula