A.) An aqueous solution of potassium acetate, KCH3COO, contains 3.47 grams of potassium acetate and 17.4 grams of water.The percentage by mass of potassium acetate in the solution is ? B.)A helium-filled weather balloon has a volume of 639 L at 14.9°C and 756 mmHg. It is released and rises to an altitude of 2.72 km, where the pressure is 607 mmHg and the temperature is –1.1°C. The volume of the balloon at this altitude is ? C.) According to the following reaction, how many moles of ammonia will be formed upon the complete reaction of 0.803 moles nitrogen gas with excess hydrogen gas? nitrogen (g) + hydrogen (g) ammonia (g)  moles ammonia ?

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