If 15.0 g of hydrogen reacts with 10.7 g of oxygen, then how many g. of water is formed? How many grams of hydrogen will react with 25 g. of oxygen to produce 110 g of water?

What law states that?
-Chemestry

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)