Find the ratio of the effusion rate of hydrogen gas to the effusion rate of krypton gas.

4.243

Explanation:

The effusion is the movement of the molecules for a hole by a difference of pressure. The effusion rate is inversely proportional to the molar mass of the gas (M), and the ratio of the rates (R) of two gases can be found by Graham' Law:

R1/R2 = (√M2)/(√M1)

Let's call hydrogen gas as 1 (M1 = 2 g/mol), and krypton gas as 2 (M2 = 36 g/mol):

R1/R2 = (√36)/(√2)

R1/R2 = 4.243

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atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer