One Way of Obtaining Pure Sodium Carbonate Is Through the Decomposition

Multiple Choice

One way of obtaining pure sodium carbonate is through the decomposition of the mineral trona, Na₅(CO₃) ₂(HCO₃) $\rarr$ 2H₂O, as shown in the following reaction: 2Na₃(CO₃) (HCO₃) $\rarr$ 2H₂O(s) $\rarr$ 3Na₂CO₃(s) + CO₂(g) + 5H₂O(g)
When 15 metric ton (1 *10³ kg) of trona is decomposed, 11 metric ton of Na₂CO₃ is recovered. What is the percent yield of this reaction? (1 metric ton = 10³ kg)

A) 95%
B) 73%
C) 65%
D) 42%
E) 13%