Question

Formula c% = solute/solution x 100%.

Solutions to make:
A. 100 grams rice grains and 200mL water.
B. 375ml milk and 20grams sugar.
a. Solute: Rice grains, Solution: Water, Computation: 50%, Final Answer: 50%.
b. Solute: Rice grains, Solution: Water, Computation: 33.33%, Final Answer: 33.33%.
c. Solute: Milk, Solution: Sugar, Computation: 5.33%, Final Answer: 5.33%.
d. Solute: Milk, Solution: Sugar, Computation: 6.67%, Final Answer: 6.67%.

Answer 1

To calculate the percent by mass or percent by volume, you need to divide the mass or volume of the solute by the mass or volume of the solution and multiply by 100%.

Step-by-step explanation:

The question is asking about computing the percent of solute in a solution using the formula c% = solute/solution x 100%. The student provided two examples and their computations, but they are incorrect. To calculate the percent by mass or percent by volume, you need to divide the mass or volume of the solute by the mass or volume of the solution and multiply by 100%.

For example, in solution A with 100 grams of rice grains and 200 mL of water, the solute is the rice grains and the solution is the water. The percent by mass would be:

Percent by mass = (mass of solute / mass of solution) x 100%

= (100 g / (100 g + 200 g)) x 100%

= (100 g / 300 g) x 100%

= 33.33%

The correct computations for all the examples are:

a. 33.33%

b. 6.67%