Question

using molar mass and cameine
match the numbers in the left column to the appropriate blanks in the sentences on the right. make certain each sentence is con
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reset he
1.2 1. there are □ mol of nitrogen in 0.30 mol of caffeine.
2.0 2. there are □ mol of carbon in 2.0 mol of caffeine.
4.0
7.0 3. there are □ mol of oxygen in 3.5 mol of caffeine.
8.0 4. there are □ mol of hydrogen in 2.8 mol of caffeine.
10
16
28

Explanation:

Step1: Recall caffeine formula

Caffeine formula: $\text{C}_8\text{H}_{10}\text{N}_4\text{O}_2$ (8C,10H,4N,2O per mole)

Step2: Calculate N in 0.30 mol caffeine

Moles N = 0.30 mol caffeine × 4 mol N/mol caffeine = 1.2

Step3: Calculate C in 2.0 mol caffeine

Moles C = 2.0 mol caffeine × 8 mol C/mol caffeine = 16

Step4: Calculate O in 3.5 mol caffeine

Moles O = 3.5 mol caffeine × 2 mol O/mol caffeine = 7.0

Step5: Calculate H in 2.8 mol caffeine

Moles H = 2.8 mol caffeine × 10 mol H/mol caffeine = 28

Answer:

1. 1.2
2. 16
3. 7.0
4. 28