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What layer of the atmosphere is directly above the troposphere?

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?