If 31.8 grams of licl are dissolved in 225 grams of water, what is the concentration of the solution in percent by mass?

12.4 %

Explanation:

To calculate the mass percent of solution, we use the formula:

Given :

mass of solute (LiCl) = 31.8 grams

mass of solvent (water) = 225 grams

Mass of solution = mass of solute + mass of solvent = 31.8 g + 225 g= 256.8 g

Thus concentration of the solution in percent by mass is 12.4%

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

1.solid

2.carbon dioxide

3.helium