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22 July, 04:03

Sodiun reacts with water to give alkali solution and hydrogen gas.

a) construct a balance chenical reaction for the reaction

b) How many moles of sodiun metal react with water to make 45 dm3 of hydrogen gas and a sodiun hydroxide solution

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  1. 22 July, 05:46
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    a) 2Na + H_2O → 2NaOH + H_2; b) Moles of Na = 4.0 mol

    b) Mass of Na

    Step 1. Calculate the moles of hydrogen

    I assume that the gas is at STP (1 bar and 0 °C). At STP, the molar volume of a gas is 22.71 dm^3.

    Moles of H_2 = 45 dm^3 H_2 * (1 mol H_2/22.71 dm^3 H_2) = 1.98 mol H_2

    Step 2. Calculate the moles of sodium

    Moles of Na = 1.98 mol H_2 * 2 mol Na/1 mol H_2 = 4.0 mol Na
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