Hello people! I was wondering if you could help me solve this problem. I know it must be simple but I am new in this whole analytical chemistry and I feel a bit confused- I would appreciate it

Problem:

1. Calculate the number of millimoles contained in 500 mg of BaCrO_{4}

2. Calculate the number of grams that would have to be dissolved and diluted to 100 mL to prepare a 0.200 M solution.