1. What is the mass in grams of each of the following: a) 4.55 mol of Be b) 6.02

Question

1. What is the mass in grams of each of the following:

a) 4.55 mol of Be

b) 6.02 x 1024 atoms of Ca

c) 3.40 x 105 mol of B

2. What is the formula weight of each of the following?

a) KClO2

b) SO3

c) N205

d) H2SO4

e) Na2 CO3

f) CH3 COOH

g) Fe2 (CrO4)3

3. What mass of each element is in 2.45 mol of H2 SO3?

4. What is he percent composition of a compound composed of 1.375g of N and 3.935g of O?

5. Convert the following mole ratios of elements to empirical formulas.

a) 1.20 mol of Si and 2.40 mol of O

b) 0.045 mol of C and 0.022 mol of S

c) 1.00 mol of X and 1.20 mol of Y

d) 3.11 mol of Fe, 4.66 mol of C, and 14.0 mol of O

6. A compound has a composition of 18.7% B, 20.7% C, 5.15% H, and 55.4% O. Its molar mass is about 115g/ mol. What is the molecular formula of the compound?

Explanation / Answer

1

a)41.1g

b)401g

c)3.67*10^6 g

2

a)106.5501 g

b)80.0632 g

c)108.0104 g g

d)98.0785 g

e)Na2 CO3

f)15.0345 g

g)111.6900 g

3)

4)

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