Question

1. What is the molecular mass of Br₂?

1. 79.90 amu
2. 79.90 g
3. 159.8 amu  
4. 159.8 g
5. 2.65 x 10²² amu

 

2. What is the average mass, in grams, of one Zn atom?

1. 65.39 amu
2. 65.39 g
3. 3.94 x 10²⁵ g
4. 1.09 x 10^-22 g
5. 1.661 x 10^-24 g

 

3. What is the mass of 4.50 x 10²² Cu atoms?

1. 7.47 x 102 g
2. 7.47 x 102 amu
3. 4.75 g
4. 63.55 amu
5. 63.55 g

 

4. One mole of iron?

1. Is heavier than one mole of lead (Pb)
2. is 77.0 g of iron
3. is 26.0 g of iron
4. weighs the same as one mole of lead.
5. None of the above

 

5. Calculate the number of moles of xenon in 12.0 g of xenon.

1. 1.00 mol
2. 0.0457 mol
3. 0.183 mol
4. 7.62 x 10^-3 mol
5. 0.0914 mol