JEE Mains · Chemistry · STD 11 - 1. Some basic concept of chemistry
The moles of methane required to produce \(81 \,g\) of water after complete combustion is \(....\,\times 10^{-2}\, mol.\) [nearest integer]
- A \(780\)
- B \(225\)
- C \(652\)
- D \(456\)
Answer & Solution
Correct Answer
(B) \(225\)
Step-by-step Solution
Detailed explanation
\(CH _{4}+2 O _{2} \rightarrow CO _{2}+2 H _{2} O\) POAC on \(H\) atom \(n _{ CH_4} \times 4= n _{ H_2 O } \times 2\) \(n _{ CH _{4}}=\frac{81}{18} \times 2 \times \frac{1}{4}=\frac{81}{36}\) \(n _{ CH _{4}}=2.25\) \(=225 \times 10^{-2}\) Nearest Integers \(=225\)
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