Question

7. What is the mole ratio of NH3 to N₂ in the balanced chemical equation below?

4NH3(g) + 6NO (g) → 5N2 (g) + 6H₂O (l)

A. 3:2
B. 4:5
C. 10:11
D. 1:1

8. What mass of glucose (C6H12O6) can be produced from a photosynthesis reaction that occurs using 10
moles of CO₂?
6CO₂ (g) + 6H₂O (1)→ C6H12O6 (aq) + 602 (g)

A 10 grams
B. 180 grams
C. 300 grams
D. 1,080 grams

9. During photosynthesis, how many moles of water (H₂O) are needed to produce 150 grams of glucose
(C6H12O6)?
A. 2 moles
B. 3 moles
C. 4 moles
D. 5 moles

10. During photosynthesis, how many grams of oxygen gas (0₂) are produced from 55 grams of carbon
dioxide gas (CO₂)?
A. 32 grams 0₂
B. 40 grams 0₂
C. 44 grams 0₂
D. 55 grams O₂

Answer 1

7) From the coefficients of the equation, the answer is 4:5.

8) From the coefficients of the equation, for every 6 moles of carbon dioxide consumed, 1 moleof glucose is consumed. This means that 1.66 moles of glucose is produced. Glucose has a formula mass of 180.16 g/.mol, so the answer is (1.66)(180.16), which is about 300 grams.

9) From the coefficients of the equation, we know that for every 6 moles of water consumed, 1 mole of glucose is consumed. Since we want 150 grams of glucose, and glucose has a formula mass of 180.16 g/mol, we want 150/180.16 = 0.83 mol of glucose. Thus, we need 0.83(6) moles of water, which is 5 moles to 1 sf.

10) From the coefficients of the equation, we know that for every 6 moles of carbon dioxide produced, 6 molds of oxygen are produced. Since carbon dioxide has a formula mass of 44.009 g/mol, 55 grams is about 1.25 moles. Thus, since oxygen has a formula mass of about 32 g/mol, the answer is 32(1.25), which is about 55 grams.