Chemistry Indiana Jones HMWK

Question

A quantity of sand has a mass of 1200g and a volume of 750cm^3. What is the density of sand?

Correct Answer: 1.6 g/cm^3 (which I got)

the part I’m confused on is as follows......

The volumes of sand in the bag was the same as the volume of the idol. What is the mass of sand in the bag? (See question 6)

#6

A good statue has a volume of about 1.5L. How many cm^3 is this?

I got 1,500 (2sf) /1(1sf) =1,500cm^3 which rounded to the correct number of significant figures is 2,000cm^3 (which should be the correct answer, no?)

I got it wrong^^^

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Back to the following question...

A quantity of sand has a mass of 1200g and a volume of 750cm^3. What is the density of sand?

Correct Answer: 1.6 g/cm^3 (which I got)

the part I’m confused on is as follows......

The volumes of sand in the bag was the same as the volume of the idol. What is the mass of sand in the bag? (See question 6)

In response to the question...I did.....

2000(1.6) =3,200 which rounded to the correct figure is (3,000) but some how it’s incorrect.

Am I doing it correctly and it’s just a flaw on behalf of the teacher?

Answer 1

One milliliter is equal to one cubic centimeter.

One liter is equal to 1000 milliliters, so it is equal to 1000 cubic centimeters.

1.5 liters would therefore be equal to 1500 cubic centimeters. There are two significant figures in 1.5 liters and two significant figures in 1500 cubic centimeters.

To get the mass of sand in the bag, multiply the volume (1500 cubic centimeters) by the density you figured out in the first part (1.6 grams per cubic centimeter)

1500 cm^3 * (1.6 g/cm^3) = 2400 grams. Once again, 2400 grams also has two significant figures.