A) \[{{C}_{3}}{{H}_{6}}{{O}_{3}}\]
B) \[{{C}_{2}}{{H}_{4}}{{O}_{2}}\]
C) \[C{{H}_{2}}O\]
D) \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\]
Correct Answer: B
Solution :
Key Idea: Use the following formulas to find molecular formula of compound. Molecular mass \[=2\times \] vapour density \[n=\frac{molecular\text{ }mass}{empirical\text{ }formula\text{ }mass}\] Molecular formula \[=n\times \] empirical formula Given, Empirical formula \[=C{{H}_{2}}O\] Vapour density = 30 \[\therefore \] Molecular mass \[=2\times \] vapour density \[=2\times 30=60\] \[n=\frac{molecular\text{ }mass}{empirical\text{ }formula\text{ }mass}\] \[=\frac{60}{12+2\times 1+16}\] \[=\frac{60}{30}=2\] \[\therefore \] Molecular formula \[=2\,(C{{H}_{2}}O)\] \[={{C}_{2}}{{H}_{4}}{{O}_{2}}\]
You need to login to perform this action.
You will be redirected in
3 sec
