4.6 g Na is dissolved in 1 liter of water. Then how much H2 gas will be evolved at S.T.P.?
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2Na + 2H2O = 2NaOH + H2
2 moles of Na dissolve in 2 moles of water to evolve 1 mole of hydrogen gas.
Means 46 g of Na reacts with 36 g of water to form 2 g of hydrogen.
So 4.6 g will only react with 3.6 g of water to form 0.2 g of hydrogen. Rest water will remain unreacted.
Rayhan333:
but the options are 1). 2.24L 2. ) 1.12 L 3) 4.48L 4) 11.2L
2.24 L is the right answer.
then wat about 1 litre
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