💯 Formula of Nitrogen Oxide | Calculating the Maximum Mass | Highest Refinement Cost

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Question 13

20 mL of nitrogen reacts with 50 mL of oxygen gas to form
20 mL of gaseous nitrogen oxide (at the same temperature and pressure). What is the formula for the gaseous oxide of nitrogen?

(A) NO2
(B) N2O4
(C) N2O5
(D) N5O2

Answer: (C)

Question 14

Which of the following contains the largest mass?

(A) 7.0 g of lithium
(B) 0.25 mol of oxygen
(C) 0.20 mol of chlorine
(D) 5.0 mol of hydrogen

Answer: (C)

Question 15

Which of these metals is most likely to have the highest
refinement cost?

(A) Gold
(B) Aluminium
(C) Copper
(D) Platinum

Answer: (B)