Question:
Which one of the following statements is NOT correct ?
Which one of the following statements is NOT correct ?
Options:
- a) Half mole of nitrogen gas is measured 11.2 litres at STP.
- b) 17 grams of ammonia gas contains 6.022 × 1023 molecules at STP.
- c) 22.4 litres of CO2 gas at STP contains 44 grams of molecules.
- d) 4 grams of hydrogen gas contains 6.022 × 1023 molecules.
- a) Half mole of nitrogen gas is measured 11.2 litres at STP.
- b) 17 grams of ammonia gas contains 6.022 × 1023 molecules at STP.
- c) 22.4 litres of CO2 gas at STP contains 44 grams of molecules.
- d) 4 grams of hydrogen gas contains 6.022 × 1023 molecules.
correct answer : d)
Explanation:
At STP, 1 mole of any gas occupies 22.4 L, so 0.5 mole of N2 occupies 11.2 L (a is correct). 17g of NH3 (1 mole) contains Avogadro’s number of molecules (b is correct). 22.4L of CO2 is 1 mole = 44g (c is correct). 4g of H2 is 2 moles, which contains 2 * Avogadro’s number = 1.2 x 10^24 molecules. Statement (d) is incorrect.
At STP, 1 mole of any gas occupies 22.4 L, so 0.5 mole of N2 occupies 11.2 L (a is correct). 17g of NH3 (1 mole) contains Avogadro’s number of molecules (b is correct). 22.4L of CO2 is 1 mole = 44g (c is correct). 4g of H2 is 2 moles, which contains 2 * Avogadro’s number = 1.2 x 10^24 molecules. Statement (d) is incorrect.