The density of iron is 7.87 g/mL. What is the mass of a 3.00cm × 4.00 cm × 1.00 cm block of iron?

Question

Express your answer to three significant figures and include the appropriate units.
 

I got 94.4m as the answer....but the system is telling me that it is not correct.

 

Thank you!

Answer 1

Volume = L · H · W   In this case, 3.00cm · 4.00cm · 1.00cm = 12cm³

 

Density = mass per unit volume; mass = density · volume

 

Since the volume is one milliliter, and one milliliter is equal to one cubic centimeter, the mass = density · volume = 7.87g/cm³ · 12cm³ = 94.44g

 

Your answer was close, but the units you gave were meters, not grams.

 

Since the data had values only to 2 decimal places, the answer must be at the same level.