Question

M(H2)=2,1 грамм m(H20)=?

Answer 1

Дано:

m(H2)=2,1 г

Найти:

m(H2O)-?

2 H2+O2=2 H2O

1) n(H2)+m/M

M(H2)=1*2=2  г/моль

n(H2)=2,1 г/2 г/моль=1.05 моль

n(H2)=1.05 моль

Так как и у H2 и у H2O коэффиценты одинаковые =>

=> n(H2O)=n(H2)=1.05 моль

n(H2O)=1.05 моль

m=n*M

M(H2O)=1*2+16=18 г/моль

m(H2O)=1,05 моль*18 г/моль=18,9 г

m(H2O)=18,9 г

Ответ:m(H2O)=18,9 г

Answer 2

To answer this question, we need some additional information. It seems like you're providing the molar masses of two substances: Molar mass of H2 (hydrogen gas) is 2.01 grams per mole, and molar mass of H2O (water) is unknown (you provided the chemical formula but not the molar mass).

If you could provide the molar mass of water (H2O), I'd be able to help you calculate the mass of a certain quantity of water. Alternatively, if you have the number of moles of water, I can also assist with the calculation.

Please provide the molar mass of water or any other relevant information so that I can give you a precise answer.