Percentage Composition of an Element in a Compound

Q.

A 0.24g sample of a compound of oxygen and boron was found by analysis to contain 0.096g of boron and 0.144g of oxygen. Calculate the percentage composition of the compound by weight.

Q.

What is the percentage composition of iron in ferric sulphate, given mass of iron is 56 amu?

1. 14%

2. 28%

3. 42%

4. 56%

Q. Mass percentage of sulphur in sulphuric acid is .

1. 32.6%
2. 50 %
3. 80 %

Q.

The pH of a solution of sodium hydroxide is 9. What will be its pH when this solution is diluted?

1. Less than 9

2. More than 9

3. Equal to 9

4. Equal to 10

Q.

"Negative LOGARITHM to the base 10 of the hydrogen ion concentration" is known as:

1. pH

2. PH

3. ph

4. P-H

Q.

Calculate the percentage composition of carbon elements in ${\mathrm{Na}}_2{\mathrm{CO}}_3$.

Q. Calculate the percentage composition of potassium in potassium chlorate ($KCl{O}_3$).
Given: Atomic mass of K = 39, Cl = 35.5 and O = 16

1. 31.83%
2. 35.83%
3. 25.74%
4. 22%

Q.

A saturated solution of ammonia in water having a specific gravity of 0.88 is called

1. Liquid ammonia

2. Liquor ammonia

3. Liquor ammonia fortis

4. Liquid ammonia fortis

Q. The percentage of carbon in carbonic acid is

1. 19.35%
2. 50%
3. 81%

Q.

The pH values of two acids A and B are $1$ and $5$ respectively. Which is the strong acid?

Q. Calculate the mass percentage composition of the elements in nitric acid. $(H=1,N=14,O_s=16)$

Q. Calculate the percentage of chlorine present in calcium chloride.

Q.

$\%$ mass of an element = $\frac{\_\_\_}{Molarmassofthecompound}\times 100$

Q.

The mass percentage of nitrogen in urea ($N{H}_{2}CON{H}_2$)is:

1. $85$
2. $46$
3. $18$
4. $28$

Q.

Percentage composition of hydrogen in benzene ($C_6{H}_6$) is :

1. $8\%$
2. $50\%$
3. $7.7\%$
4. $5\%$

Q.

In a biogas plant, methane gas ($C{H}_4$) is produced as a fuel. Find the mass ratio of carbon to hydrogen in methane.

1. $3:1$

2. $2:1$

3. $1:3$

4. $4:2$

Q. The % of an element in a compound is the mass of that element as a percentage of the total mass of that compound.

1. True
2. False

Q. In an experiment, the following reaction takes place.
$C\left(s\right)+O_2\left(g\right)\to {\mathrm{CO}}_2\left(g\right)12g32g44g$
How much mass of carbon dioxide will be produced, when 12 g of carbon reacts with 48 g of oxygen?

1. 14 g

2. 10 g

3. 8 g

4. 7 g

Q. Percentage composition of hydrogen in water is 11.11%.

1. True
2. False

Q.

What is the mass percentage of hydrogen in the H₂O molecule?

1. 5.55%

2. 33.33%

3. 22.22%

4. 11.11%