Q1) Hw many moles of water(H20) will be formed from 31.3g of hydrogen(H2)???????????

Answer 1

Enough to fill 1 cup

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The first step in solving this problem is writing the chemical equation:

2H2 + O2 -> 2H2O

The significance of the above is the fact the moles of hydrogen are going to equal the moles of water. Therefore, the answer is going to be how many moles of hydrogen are 31.3 grams equivalent to.

To find this, divide this weight by the molecular weight of hydrogen. However, there is a trick. Hydrogen molecules are not the same as hydropgen atoms, and the weight will differ. From the periodic table, the atomic weight of hydrogen is essentially 1 gram, but there are two atoms in a hydrogen molecule - so the molecular weight is going to be 2 grams. Therefore, the moles of hydrogen molecules is (31.3 grams) / (2 grams/mole). This yields 15.65 moles of hydrogen molecules. Thus, there are going to be 15.65 moles of water from the reaction.

BTW: 15.65 moles of water weighs 281.7 grams. This is a volume of roughly 300 ml, or roughly a cup. Of course when the water forms, it will be steam.

Answer 2

H2+1/2 O2------>H2O
2 grH2 1 mole H2O
31.3 grH2 xmoleH2O
x=31.3/2=15.65moleH2O

Answer 3

the same number of moles of H2.
31.3/2= 15.65 moles = 281.7 ml of water

Answer 4

31.3/2 moles

Answer 5

h2 dosen't turn to water