The combustion of hydrogen consumed 4.48 liters of oxygen. determine the mass of the resulting water.

| July 11, 2021 | education

In order to solve this problem, you first need to draw up a reaction equation that looks like this:
2H2 + O2 = 2H2O
we consider the amount of oxygen that was spent on the combustion of hydrogen, for this we divide the volume by the molar volume:
n = V / Vm
Substitute and solve, ode Vm = 22.4 l / mol
n (O2) = 4.48 / 22.4 = 0.2 mol
It can be seen from the equation that for 1 mole of oxygen there are 2 moles of water, which means that the amount of water is 2 times more than the amount of oxygen, that is, the following is obtained:
n (O2) = 2n (H2O) = 0.4 mol
that is, the amount of water is 0.4 mol
Next, we consider the mass of water, for this we multiply the molar mass by the amount of water substance, we get the following
m (H2O) = 18 × 0.4 = 7.2 g
Answer: the mass of the resulting water is 7.2 grams.



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