Single Choice

$$14$$ g of an element X combines with $$16$$ g of oxygen. On the basis of this, which of the following statement is correct? [At.wt of oxygen $$= 16$$]

AThe element X could have an atomic weight 7 and its oxide formula is $$XO$$.
BThe element X could have an atomic weight 14 and its oxide formula is $$X_{2}O_{3}$$.
CThe element X could have an atomic weight 7 and its oxide formula is $$X_{2}O$$.
Correct Answer
DThe element X could have an atomic weight 14 and its oxide formula is $$XO_{2}$$.

Solution

The atomic weight of oxygen is $$16$$ g. The atomic weight of the element X can be either $$7$$ g or $$14$$ g.

One mole of the oxide will contain one mole ($$16$$ g) of oxygen atoms and one mole ($$14$$ g, if atomic weight of X is $$14$$) of X atoms. Its formula will be $$XO$$.

One mole of the oxide will contain one mole ($$16$$ g) of oxygen atoms and two moles ($$14$$ g, if atomic weight of X is $$7$$) of X atoms. Its formula will be $$X_2O$$.

Thus, option C is correct.

SIMILAR QUESTIONS

Mole Concept

The relative number of atoms of different elements in a compound are as follows: $$A =$$ $$1.33$$, $$B =$$ $$1$$ and $$C$$ $$=$$ $$1.5$$. The empirical formula of the compound is:

Mole Concept

The empirical formula and the percent composition of dimethyhydrazine, $$C_2H_8N_2$$ which is a colourless liquid used as a rocket fuel, are $$CH_4N, C:40\%$$, $$H: 13.3\% $$ and $$ N:46.7\%$$. If true enter 1, else enter 0.

Mole Concept

An experiment showed that in a lead chloride solution, 6.21 g of lead combined with 4.26 g of chlorine. The empirical formula of this chloride is:

Mole Concept

Determine the empirical formula of an oxide of iron which has $$69.9\%$$ iron and $$30.1\%$$ dioxygen by mass.

Mole Concept

The relative number of atoms of elements, $$X$$ and $$Y$$ in a compound is 0.25 and 0.5. The empirical formula of compound is:

Mole Concept

Two elements 'P' and 'Q' combine to form a compound. Atomic mass of 'P' is 12 and 'Q' is 16. Percentage of 'P' in the compound is 27.3. What will be the empirical formula of the compound?

Mole Concept

An organic compound contains $$C = 40$$%, $$O= 53.5$$%, and $$H = 6.5$$%. The empirical formula of the compound is:

Mole Concept

A compound containing $$80$$% $$C$$ and $$20$$% $$H$$ is likely to be :

Mole Concept

$$60\ gm$$ of an organic compound on analysis is found to have $$C = 24\ g, H = 4\ g$$ and $$O = 32\ g$$. The empirical formula of compound is:

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