What is the density (g/ml) of an object that has a mass of 14.01 grams and when placed into a graduated cylinder, causes the water level to rise from 25.2 ml to 33.6 ml?

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.

What is the percentage composition of carbon in the compound ch4

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