Practice Problems for March 4

1. Calculate how many atoms there are in 2.49 moles of arsenic

2. Calculate how many molecules there are in 0.0034 moles of glucose C6H12O6.

3. What is the molar weight of potassium permanganate?

4. Calculate the mass of 0.967 moles LiCl. 5.

What is the mass of 0.973 moles Lithium sulfate.

6. What is the mass of 9.94 x 1023 atoms of Br?

7. A molecule is 40 % C, 6.7 % H, and 53 % O. The MW is 360. What are the empirical and molecular formulas?

8. How many grams of K2SO4 are there in 0.45 moles K2SO4? How many atoms of K are there?

9. What is the MW of (NH4)2CO3? 10. How many total atoms are there in 25 g of CO2?