How many moles are there in 321g of silver hydroxide? Need to show my work so please show how you got it

-A 10.0 L cylinder of argon is stored in a laboratory at standard temperature and
pressure. When used for an activity it is compressed to
5.00 L and heated to 50.0 °C. Which best represents the new pressure after the
temperature and volume have changed?

Meiosis,  50% of the parent cell