Question

8 28.5 g of iron shot raises the water level from 45.50 ml to 49.10 ml. calculate the density of iron.
a 8.00 g/ml
b 7.50 g/ml
c 7.92 g/ml
d 6.00 g/ml

Explanation:

Step1: Calculate volume of iron

The volume of iron is equal to the change in water - level. So, $V = 49.10\ mL−45.50\ mL = 3.60\ mL$.

Step2: Calculate density of iron

The density formula is $
ho=\frac{m}{V}$, where $m = 28.5\ g$ and $V = 3.60\ mL$. Then $
ho=\frac{28.5\ g}{3.60\ mL}\approx7.92\ g/mL$.

Answer:

C. 7.92 g/mL