Question

Calculate the mass of 1,500 mL of a gas whose density is 0.78 g/L. Express your answer in grams using the correct number of significant figures. Do not enter your answer using scientific notation.

Answer 1

m = 1.2 g

Step-by-step explanation:

Density

`D=m/V` where D is density, m is mass and V is volume.

We're given:

• D = 0.78 g/L
• V = 1500 mL

First, convert mL to L:

1500 mL = 1.5 L

Then, multiply the volume by density to find mass:

m = 0.78 × 1.5

m = 1.17 g

Since all the given values had 2 significant figures, round our answer to 2 significant figures:

m = 1.2 g