Homework Help: CHEM PLZ URGENT!!

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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