Question: How many atoms are present in 34.69 moles of Mg?

Answer: 34.69 moles *(6.02/1 mole)= 2.089

Question: How many moles of Mn3P2 are present in 4.094 x 10^24 formula units of Mn3P2?

Answer: (4.094

(1 mole/6.02*10^23 formula units)

Question: Calculate the Molar Mass of the following compounds:

Na3PO4

23x3=69

1x31=31

4*16=64

Answer: 164g/mol

Question: Find the Percent composition of (NH4)2SO4

Answer: N=2x14=28=21%

H=8x1=8=6%

S=1X32=24%

O=4x16=64=48%

Whole: 132

Question: How many grams of CaI2 are present in 3.28 moles?

Answer: (3.28CaI2/1) * (294g/1CaI2)= 964g CaI2

Question: How many moles of AgCl are there in 4.98 grams?

Ag=108

Cl=35

Answer: (4.98g/1) * (1/143g)=0.0348mol

Question: Calculate the number of molecules in 8.33 grams of O2

Answer: (8.33g/1)

(6.02

10^23

Question: Calculate the number of atoms in 43.33 grams of iron, Fe?

Answer: (43.33g/1)

(6.02

10^23

Question: Calculate the number of formula units of 32.8 grams of Cu2S

Cu=2*64=128

S=32=32

Whole=160

Answer: (32.8g/1)

(6.02

10^23

Question: Calculate the number of grams of SO2 in 3.92 x 10^25 molecules of sulfur dioxide

Answer: