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How many moles of K2SO4 are in 15.0 g of K2SO4?  

When 3.00 grams of CH4 are mixed with 5.00 grams of O2 , how much water can be produced?   CH4 + 2O2 → CO2 + 2H2O  

How many grams of water, H2O, are present in 2.5 moles of H2O?  

For the reaction: 2H2O (l) + 137 kcal → 2H2 (g) + O2 (g) How many kcal are needed to form 2.00 grams of H2 (g)?    

For the reaction below, which substance is oxidized?  2 Zn + O2 –> 2 ZnO

The shape of the nitrogen trichloride molecule is

Sulfur-35 has a half-life of 84 days. How many days have elapsed after 4 half-lifes?  

Which type of radiation is most damaging if inhaled or ingested?                                                     

The symbol  4 2He is a symbol used for:                                                                                 

Which one of the following compounds contains an ion with a 2+ charge?