12 g of hydrogen reacts with 4 moles of oxygen then how many moles oof water will be formed?

Two moles of O2.

Four molecules of hydrogen are formed by eight atoms. With these eight atoms you can form four molecules of H2O, right? So you’ll need four oxygen atoms, that is, two molecules of it. Channge the word to moles and that’s it. Remenmber a mole is just a big bundle of particles (6.02x10^23) 602 thousand million million millions of them. The proportion holds the same for 1, 2, 10, 1000, 1000000 etc.

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