The molar mass of two equally sized samples of unknown gaseous compounds is shown in the table. Molar Mass Comparison
Gas Molar Mass
A 17 g/mol
B 36.5 g/mol
Which statement describes the density and diffusion of both gases at STP?
a. Gas A has a higher density and diffuses faster than Gas B.
b. Gas A has a higher density and diffuses slower than Gas B.
c. Gas A has a lower density and diffuses faster than Gas B
d. Gas A has a lower density and diffuses slower than Gas B.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

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