Question

2. What is the percent by mass of a
solution made by dissolving 20.0 g of
NaCl into 180.0 ml of water?
O A - 10.0%
O B-11.1 %
O C-80.0 %
O D - 20.0%​

Answer 1

Answer:

WHAT I THINK IS.....

IT WILL BE......

••A---10.0%

Answer 2

Given

The Volume of water= 180 ml

amount of dissolved Nacl= 20g

To find

Mass percentage of the salt

Solution

The solution to the above can be done using the simple equation for concentration

• Mass of solute = 20g
• Mass of water(solvent)= 180ml

Total mass of the solution= 180 +20 =200g or ml

So concentration of the soluiton = $\frac{mass of solute}{mass of solvent(solution)} *100$

So we get $\frac{20*100}{200}$ =  10%

So the final answer and the mass percentage of the salt= 10%