Question

A student wants to make a 5.00%solution of rubidium chloride using 0.377g of the substance. what mass of water will be needed to make the solution?

Answer 1

 The mass of water that will  be needed to make the solution  is calculated as below

%  solution  =  mass of the solute/mass of the solvent(water) x100

%  solution = 5% = 5/100
mass of the solute =0.377 g
mass of the  solvent = ?

let the mass  of the solvent be  represented by Y

= 5/100 =0.377/y

by cross multiplication

5y=  37.7
divide both side by 5

y =7.54  grams

Answer 2

Mass is the weight of the substance occupied in the reaction.  7.54 gms of water will be needed to make the solution.

What is a percentage solution?

A percentage solution is a ratio of the mass of solute and the mass of the solvent. The formula for the percentage solution can be given as,

$\rm \% \;solution = \rm \dfrac{\text{mass of the solute}}{\text{mass of the solvent}}\times 100$

Given,

Percentage solution = 5 %

Mass of solute = 0.377 gm

Mass of solvent = x

Substituting values in the equation:

$\begin{aligned}\rm 5\% &= \rm \dfrac{0.377}{x} \times 100\\\\\rm 5x &= 37.7\\\\&= 7.54\;\rm gm\end{aligned}$

Therefore, 7.54 gm of water is required.

Learn more about the percent solution here:

https://brainly.com/question/15450572