Please help me with questions 43, 44, and 45

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Read the claim. breakfast is an important meal. it jump starts the body’s process of using calories to break down food. appetite can decrease with age, but going too long without eating causes metabolism to slow down. current research shows that incorporating legumes such as lentils and chickpeas into meals boosts metabolism for twenty-four hours. who might benefit from this claim? people who have a fast metabolism stores that sell exercise equipment people who take vitamin supplements grocery stores that sell legumes

8. what happens to matter during a chemical reaction