Posted by **Ania** on Friday, February 22, 2008 at 9:30am.

19. A block of aluminum has a volume of 126.5 cm3. Its density = 2.70 g/cm3. What is the mass

of the aluminum?

A) 342 g

B) 46.9 g

C) 127 g

D) 0.0213 g

E) 124 g

The answer is A.....But I still can't figure it out....I keep getting D as an answer..

- CHEM PLZ URGENT!! -
**bobpursley**, Friday, February 22, 2008 at 9:36am
mass= density*volume

- CHEM PLZ URGENT!! -
**drwls**, Friday, February 22, 2008 at 9:46am
You are dividing density by volume instead of multiplying. BobPursley gave your the correct formula to use.

- CHEM PLZ URGENT!! -
**Damon**, Friday, February 22, 2008 at 4:55pm
check your units

2.70 g/cm^3 * 126.5 cm^3

units are

g cm^3/cm^3

the cm^3 cancel

and you are left with g, grams

If you do it upside down somehow, you will end up with cm^6 which you know right off is wrong.

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