Question

Дано: m(O₂)=10 г. O₂+H₂=H₂O m(H₂O)=? Как решить?

Answer 1

Дано: m(O₂)=10 г.
O₂+H₂=H₂O
Найти:
m(H₂O)=?
Решение:
O₂+2H₂=2H₂O
n(O2)=10г/32г/моль=0,3моль
0,3моль/1моль=х моль/2 моль
Х=0,6 моль
Мr(H2O)=18 г/моль
m(H2O)=0,6 моль×18 г/ моль=10,8 г
Ответ: 10,8 г

Answer 2

Given Information:

- m(O₂) = 10 г - O₂ + H₂ = H₂O - m(H₂O) = ?

Solution:

To find the mass of H₂O, we need to calculate the molar mass of H₂O and then use stoichiometry to determine the mass.

1. Calculate the molar mass of H₂O: - The molar mass of H₂O is the sum of the atomic masses of hydrogen (H) and oxygen (O). - The atomic mass of hydrogen (H) is approximately 1 g/mol. - The atomic mass of oxygen (O) is approximately 16 g/mol. - Therefore, the molar mass of H₂O is 1 g/mol (2 hydrogen atoms) + 16 g/mol (1 oxygen atom) = 18 g/mol.

2. Use stoichiometry to determine the mass of H₂O: - From the balanced equation O₂ + H₂ = H₂O, we can see that 1 mole of O₂ reacts with 2 moles of H₂ to produce 2 moles of H₂O. - Since the molar mass of H₂O is 18 g/mol, 2 moles of H₂O would have a mass of 18 g/mol * 2 = 36 g/mol. - Therefore, the mass of H₂O is 36 g/mol.

Answer: The mass of H₂O is 36 g.