Question

Choose the correct answer from the options given below :

The ratio between the number of molecules in $2\mathrm{g}$ of hydrogen and $32\mathrm{g}$ of oxygen is :
[Given that H=1, O=16 ]

• A. 1:2
• B. 1:0.01
• C. 1:1
• D. 0.01:1

Answer 1

The correct option is C

1:1

Step 1 Concept

1 mole of a substance is $6.022\times {10}^{23}$ such as atoms, molecules, or ions.

Step 2 Correct option

$1g$ of $\mathrm{H}=16\mathrm{g}$ of $\mathrm{O}$
Similarly,

$2\mathrm{g}$ of $\mathrm{H}=32\mathrm{g}$ of $O$

The ratio between the number of molecules in $2\mathrm{g}$ of hydrogen and $32\mathrm{g}$ of oxygen is $1:1$

So, Option C is correct.