Which one of the following statements is NOT correct?
- A. Half mole of nitrogen gas is measured 11.2 litre at STP
- B. 17 gram of ammonia gas contains 6.022\times10^{23} molecules at STP
- C. 22.4 litre of CO_{2} gas at STP contains 44 gram of molecules
- D. 4 gram of hydrogen gas contains 6.022\times10^{23} molecules ✓
Correct Answer: D. 4 gram of hydrogen gas contains 6.022\times10^{23} molecules
Explanation
The molar mass of hydrogen gas (H_{2}) is 2 g/mol. Therefore, 4 grams of hydrogen gas equals 2 moles, which would contain 2 \times 6.022\times10^{23} molecules.
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