Question

11. Mercury is the only metal that occurs at the Earth's surface in liquid form. In fact, it has a density of 30 lbs/L. What is the density of mercury in kg/L? (Note: 1 lb = 0.454 kg) (show your work in the space below) A) 13.62 lbs/L B) 1.362 kg/L C) 136.2 kg/L D) 13.62 kg/L

Answer 1

Answer:

D) 13.62 kg/L

Explanation:

This problem can be solved by a simple rule of three.

The problem states that Mercury has a dansy of 30 lbs/L, and asks what is the density in kg/L. We have to convert from lbs to kg.

Each lb has 0.454 kg? How many kg are there in 30 lbs?

So:

1 lb - 0.454kg

30 lb - x kg

$x = 30(0.454)$

$x = 13.62$

This means that mercury's density in kg/L is 13.62, letter D. Letter A is also 13.62, however it is not in the unit asked.