98 POINTS!!! WILL AWARD BRAINLIST!! EXTRA POINTS!! PLS HELP!!

Answer the following:

Make the following calculations of properties of gases
a. How many moles of SO2 are in 745 L at STP?
b. What is the volume of 325 moles of N2?
c. What is the density of a gas with a molar mass of 78 g/mole?


Question 18
Determine the following formula masses:
a. NH4Cl
b. NaHCO3
c. C17H18F3NO


Question 19
How many moles are each of the following?
a. 270 g KBr
b. 397 g Li2SO4


Question 20
Calculate the percent by mass of water in the following compounds
a. CoCl2.6H2O
b. PbCl2. 3H2O


Question 21
How many particles are there in
a. 0.2 moles FeSO4
b. 1.7 moles CH4


Question 22
What is the mass of
a. 1.7 moles CaBr2
b. 0.48 moles N2O


Question 23
Determine the percent composition for the following
a. A compound contains 6.2 g C, 4.1 g H, and 15.9 g O
b. A compound contains 1.2 moles C and 3.2 moles H