Question

Determine the mass in grams of hydrogen gas produced if 40.08 g of calcium react with excess aqueous hydrogen phosphate.

Answer 1

`2.02gH_2`

Step-by-step explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to to calculate the mass of hydrogen gas by firstly setting up the undergoing chemical reaction:

`2H_3PO_4+3Ca\rightarrow Ca_3(PO_4)_2+3H_2`

Thus, we apply the following stoichiometric setup, whereas the atomic mass of calcium is 40.08 g/mol, that of hydrogen is 2.02 g/mol and the mole ratio of these two substances is 3:3:

`40.08gCa*(1molCa)/(40.08gCa)*(3molH_2)/(3molCa)*(2.02gH_2)/(1molH_2) \\\\=2.02gH_2`

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