A backpacker carries 2.1 of white gas as fuel for her stove.How many pounds does the fuel add to her load? Assume the density of white gas to be 0.79 . Express your answer using two significant figures

You need to put dimensions with your numbers.

2.1 what? pounds? liters? kg? cups?

I assume the density you provided has dimensions of g/cm^3. You should have said so, or called it "specific gravity"

The white gas stove and fuel container also add to her load. They want you to ignore that.

To find the weight of the white gas fuel in pounds, we need to multiply the volume of the fuel (2.1 L) by its density (0.79 g/mL) and then convert the result to pounds.

First, let's convert the volume from liters to milliliters. Since 1 L = 1000 mL, the volume of the fuel in milliliters is:

2.1 L * 1000 mL/L = 2100 mL

Next, we need to convert the volume from milliliters to grams. Since the density of white gas is 0.79 g/mL, the weight of the fuel in grams is:

2100 mL * 0.79 g/mL = 1659 g

Finally, we need to convert the weight from grams to pounds. Since 1 lb = 453.592 g, the weight of the fuel in pounds is:

1659 g / 453.592 g/lb = 3.65 lb

Therefore, the fuel adds approximately 3.65 pounds to the backpacker's load.