Chapter 3, Problem 1STP

Interpretation Introduction

Interpretation:

The value for % Cl and % F, should be determined for sample II.

Concept introduction:

The mass percentage is defined as the percentage of component present in it. The mass percentage of the element is the mass of element divided by the total mass of the compound and multiplied by 100.

$\text{Mass percentage=}\frac{\text{mass}\text{of}\text{element}}{\text{mass}\text{of}\text{total}\text{compound}}\text{×100}$

Answer to Problem 1STP

Correct answer: The correct option is (d).

Explanation of Solution

Reason for correct option:

According to the given table:

Mass Analysis of two chlorine-fluorine sample
Sample	Mass of chlorine (g)	Mass of fluorine (g)	% Cl	%F
I	$13.022$	$6.978$	$65.11$	$34.89$
II	$5.753$	$9.248$	?	?

The mass percentage of the elements is calculated as-

The given value of mass of Cl for sample II from the table = 5.753

The given value of mass of F for sample II from the table = 9.248

$\%Cl=\frac{\text{5}\text{.753}\text{g}}{\text{5}\text{.753}\text{g + 9}\text{.248}\text{g}}\text{×100}\text{= 38}\text{.35\%}$

$\%F=\frac{\text{9}\text{.248}\text{g}}{\text{5}\text{.753}\text{g + 9}\text{.248}\text{g}}\text{×100}\text{=61}\text{.65\%}$

The complete table is:

Mass Analysis of two chlorine-fluorine sample
Sample	Mass of chlorine (g)	Mass of fluorine (g)	% Cl	%F
I	$13.022$	$6.978$	$65.11$	$34.89$
II	$5.753$	$9.248$	$38.35$	$61.65$

Hence, the correct option is (d).

Conclusion

Reasons for incorrect options:

Option (a) Value given in this option is not equals to $38.35\%$ and $61.65\%$. Hence, this is an incorrect.

Option (b)Value given in this option is not equals to $38.35\%$ and $61.65\%$. Hence, this is an incorrect.

Option (c) Value given in this option is not equals to $38.35\%$ and $61.65\%$. Hence, this is an incorrect.