Question

Using the following data, determine the percent composition (by mass) of the NaCl (salt) in a binary mixture. The mass of the unknown binary mixture is 23.76g and the mass of the SiO2 (sand) alone is 15.01g. Record your answer to 3 significant figures, and include the percentage sign ('%'), or 'percent'.

Answer 1

Answer: The percent composition (by mass) of the NaCl (salt) in a binary mixture is 36.8%

Explanation:

Binary mixture is a mixture containing two components which are mixed together in any proportion and do not combine chemically with each other.

Mass of mixture=Mass of $SiO_2$+Mass of $NaCl$ = 23.76 g

Mass of $SiO_2$ = 15.01 g

Mass of $NaCl$ = 23.76 g - 15.01 g =8.75 g

To calculate the mass percentage ,we use the formula:

$\text{Mass percent}=\frac{\text{Mass of} NaCl}{\text{Mass of mixture}}\times 100$

Putting values in above equation, we get:

${\text{Mass percent of} NaCl}=\frac{8.75g}{23.76g}\times 100=36.8\%$

Thus the percent composition (by mass) of the NaCl (salt) in a binary mixture is 36.8%