Question

A water holding tank measures 85 m long, 55 m wide, and 9 m deep. Traces of mercury have been found in the tank, with a concen- tration of 65 mg/L.
What is the total mass of mercury in the tank?
Answer in units of kg.

Answer 1

Answer:

Mass = 2734.875 kg

Explanation:

Given that A water holding tank measures 85 m long, 55 m wide, and 9 m deep.

The volume = 85 × 55 × 9 =

= 42075 m^3

Traces of mercury have been found in the tank, with a concen- tration of 65 mg/L.

1 m^3 = 1000 L

Convert cubic meters to litres.

42075 × 1000 = 42075000 L

From definition of density,

Density = mass ÷ volume.

Substitute the given density and the calculated density into the formula

65 = mass ÷ 42075000

Cross multiply

Mass = 65 × 42075000

Mass = 2734875000 mg

Convert mg to kg

To do that, you will divide the answer by 1000000

2734875000 ÷ 1000000

= 2734.875 kg