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

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

the answer is 303.15 or 303

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.