Solid magnesium has a specific heat of 1.01 j/gâ°c. how much heat is given off by a 20.0 gram sample of magnesium when it cools from 70.0â°c to 50.0â°c?

Which of the following statements is true? question 4 options: nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not. chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not. neither chemical reaction rates nor nuclear decay rates vary with the conditions of the reaction. both chemical reaction rates and nuclear decay rates vary with the conditions of the reaction.

0.09 moles of sodium sulfate in 12 ml of solution

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.