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..
mass= density*volume
You are dividing density by volume instead of multiplying. BobPursley gave your the correct formula to use.
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.
To find the mass of the aluminum, you can use the formula:
density = mass / volume
Rearranging the formula, we have:
mass = density * volume
In this problem, the density of aluminum is given as 2.70 g/cm3 and the volume is given as 126.5 cm3.
Substituting these values into the formula, we get:
mass = 2.70 g/cm3 * 126.5 cm3
Calculating the right side of the equation:
mass = 341.55 g
Therefore, the mass of the aluminum is 341.55 g, which is closest to option A, 342 g.