#1: a gas effuses 4.0 times faster than oxygen (o2). what is the molecular mass of the gas? a. 1.0 g/mol b. 2.0 g/mol c. 4.0 g/mol d. 7.67 g/mol **not i think it's either b or what do u think? @mertsj : ),

From Graham's law of diffusion
R1/R2 = √M2/M1 where R1 and R2 is the rate of diffusion of Oxygen and
unknown gas respectively
M1 and M2 is the molar mass of Oxygen and unknown gas respectively 
So R2 = 4 * R1
M1 = 32 and M2 = ?
So we have R1/ 4 R1 = √ x/32
(1/16) = x/32
X = 32 /16 = 2 g/mol

Butterfly wingspan is 7.7

Answer:

5.6⋅10−^19  j

do you need the explaination?