What is the percent by mass concentration of a solution that contains 4.0 g of salt dissolved in 15.5 g of water?
a.20.51%
b.21.52%
c.20.54%
d.20.75%
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What is the percent by mass concentration of a solution that contains 4.0 g of salt dissolved in 15.5 g of water?
a.20.51%
b.21.52%
c.20.54%
d.20.75%
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Answer:
C 20.54 im just thinking if you divide mass
Step-by-step explanation:
The terms "concentrated" and "dilute" provide qualitative methods of describing concentration. Although qualitative observations are necessary and have their place in every part of science, including chemistry, we have seen throughout our study of science that there is a definite need for quantitative measurements in science. This is particularly true in solution chemistry. In this section, we will explore some quantitative methods of expressing solution concentration.
Mass Percent
There are several ways of expressing the concentration of a solution by using a percentage. The mass/mass percent (% m/m) is defined as the mass of a solute divided by the mass of a solution times 100:
%m/m=massofsolutemassofsolution×100%(13.5.1)
mass of solution = mass of solute + mass solvent
If you can measure the masses of the solute and the solution, determining the mass/mass percent is easy. Each mass must be expressed in the same units to determine the proper concentration.