Which of the following statements `is//are` correct?
A mixture containing `64.0g H_(2)` and `64.0 g O_(2)` is ignited so that water is formed as follows:
`2H_(2) + O_(2) rarr 2H_(2) O`

Options

A. `H_(2) + O_(2) rarr 2 H_(2) O`
B. `O_(2)` is the limiting reagent
C. The reaction mixture contains `72.0 g of H_(2) O` and `56.0 g` of unreacted `H_(2)`.
D. The reaction mixture contains `56.0 g` of `H_(2) O` and `72.0 g` of unreacted `H_(2)`.

Answer

B, C

Explanation

`n_(H_(2)) = (64)/(2) = 32 "mol"`
`n_(O_(2)) = (64)/(32) = 2 "mol"`
1 mol of `O_(2)` requires = 2 mol of `H_(2)`
2 mol of `O_(2)` requries = 4 mol g `H_(2)`
Since `H_(2)` is present in excess, therefore, `O_(2)` is the limiting reagent
a. Wrong
b. So, `O_(2)` is the limiting reagent
c. 2 mol of `O_(2) = 4 "moles of" H_(2) O = 4 xx 18 = 72 g H_(2) O`
moles of `H_(2)` left `= 32 - 4 28 "mol" = 28 xx 2 = 56 g H_(2)`
Mixture contains `= (72 g H_(2) O + 56 g H_(2))`
wrong.