Which of the answer choices is/are an example of post-translational modification?

Which is a characteristic of mixtures?

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?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.