Can someone help me to answer this correctly, please, and explain it. Please answer these 2 short questions, I don't have more money to buy more questions. These 2 questions are different.

1. a.

1. b.

1. How many moles of Si are there in a sample that contains 13.1 grams of silicon? moles 2. How many grams of silicon are there in a sample that contains 2.65mol of Si ? grams What would you multiply "grams of vanadium" by to get the units "atoms of vanadium