1. Mercury is a silver-colored liquid. One gallon of mercury weighs 113.6 pounds

Question

1. Mercury is a silver-colored liquid. One gallon of mercury weighs 113.6 pounds. Calculate the density of mercury in grams per milliliter.

(Enter your answer to three significant figures.)

g/mL

2.

Referring to only the table, answer the following question:

Ultrasound is sound of such high frequency that it cannot be heard. The frequency is measured in hertz (vibrations per second). How many hertz corresponds to 20 megahertz?

Common Prefixes of the Metric System

(Enter your answer to one significant figure.)

Explanation / Answer

(1) One gallon = 4,546 liter. = 4546 mL = V

And 1 pound = 0.4536 kg

So, 113.6 pounds = 113.6 x 0.4536 = 51.52896 kg = 51528.96 gm. = m

So, density of mercury = m/V = 51528.96 / 4546 = 11.33 g/mL

(2) one megahertz = 10^6 Hz

So, 20 megahertz = 20 x 10^6 Hz = 2 x 10^7 Hz

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