What amount of water will be obtained if 20 g of hydrogen reacts with oxygen?

| August 7, 2021 | education

We draw up the equation for obtaining water: O2 + H2 = H2O.
We place the coefficients in the equation: O2 + 2H2 = 2H2O.
1) According to the periodic table, we determine the molar mass of hydrogen: 1. But since the molecule contains two atoms: 1 * 2 = 2.
2) Find the amount of substance hydrogen. To do this, divide the mass of hydrogen by its molar mass: 20/2 = 10 mol.
3) Consider the equation of the ongoing reaction. For two moles of hydrogen, there are two moles of water. This means that the amount of water substance is equal to the amount of hydrogen substance and is equal to 10 mol.
4) According to the periodic table, we determine the molar mass of water: 1 * 2 + 16 = 18.
5) Find the mass of the resulting water. To do this, we multiply the amount of water substance by the molar mass of water: 18 * 10 = 180 g – the answer.



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