Question

4 gm of hydrogen are ignited with 4 gm of oxygen. The weight of water formed is:

• A. 0.5 gm
• B. 3.5 gm
• C. 4.5 gm
• D. 2.5 gm

Answer 1

The correct option is C 4.5 gm

The balanced equation for hydrogen and oxygen to form water

$\underset{\left(4gm\right)}{2H_2}+\underset{\left(32\right)}{O_2}⟶2\underset{\left(36\right)}{H_{2}O}$

Given,

$4$ gms of $H_2$ and $4$ gm of $O_2$. Here oxygen acts a limiting reagent so the product will be based on the amount $O_2$.

$\underset{–}{O_2}$ $\underset{–}{H_{2}O}$

$32⟶36$

$4⟶x$

$x=\frac{36\times 4}{32}$

$x=4.5$

$\therefore$ Ans :- Option C.