2Li + H2SO4=Li2SO4 + H2 How many liters of hydrogen gas, H2 at STP can be produced from 3.0 moles of Li? The molar volume of a gas at STP is 22.4L/mol.

volume of

Explanation:

Firstly balance the given chemical equation,

From the given balance equation it is clearly that,

2 mole of Li gives  1 mole of H2 gas

⇔

⇔

⇔

hence

3 mole of Li will give 1.5 mole H2 gas

therefore volume of gas produced from 3 mole Li at

volume of H2=33.6 litre

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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