ashley4329
12.07.2019 •
Chemistry
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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Ответ:
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
Ответ: