The European Space Agency launched a probe called Rosetta in March 2004. In Augu

Question

The European Space Agency launched a probe called Rosetta in March 2004. In August 2014, Rosetta reached its destination: a comet called 67P/Churyumov-Gerasimenko. Rosetta is the first spacecraft to rendezvous with a comet, and plans to orbit the comet. It contained a lander craft, called Philae.

The Philae lander has several scientific instruments onboard, used to study the comet. ALICE is an ultraviolet imagingspectrograph, used to search for noble gases in the comet core. The ALICE instrument uses potassium bromide as one of the compounds in the analysis of noble gases. Potassium bromide has a specific gravity of 2.74. Assume the lander has a liquid sample of potassium bromide onboard that fills a 1.19-gallon [gal] container. What is the mass of the potassium bromide sample in the container, in units of kilograms [kg]?

The mass of the potassium bromide is ____kg. (Round your answer to three significant digits.)

Explanation / Answer

when we know the specific gravity of a substance simply multiply it by 8.343 to get the number of pounds of that substance in a gallon.

so we have 2.74x8.343=22.85982 pounds in one gallon

for 1.19 gallon it will be 27.203 pounds which is equal to 12.339 kg

(b)

mass of potassium bromide is 12.339 kg

Please leave a comment if you have any doubt.

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