You have a flask containing 150. g of H2O (volume is 150. mL). A) B) C) What is the mass percent of H and O, respectively, in H2O?

You have a flask containing 150. g of H2O (volume is 150. mL). A) B) C) What is the mass percent of H and O, respectively, in H2O? D) How much water (in grams) is needed to have obtain 10.0 grams of oxygen? 6. In the chemistry lab, you produce 10.0 grams of hydrogen gas from the following chemical reaction: 2HCl (aq) + Zn (s) H2 (g) + ZnCl2 (aq) a) What is the molar mass of H2? B) C) How many moles of Zn are needed to produce 10.0 g of H2? D) How many grams of Zn are needed to produce the 10.0 g of H2?