Under certain conditions, neon (ne) gas diffuses at a rate of 7.0 centimeters per second. under the same conditions, an unknown gas diffuses at a rate of 4.9 centimeters per second. what is the approximate molar mass of the unknown gas?

Graham's law of effusion states that the rate of effusion of two substances is equal to the square root of the reciprocal of their molar masses. Hence the equation becomes 7 / 4.9  = square root of x/ 20.18 wher e x is the molar mass of the unknown gas. The molar mass is equal to 41. 18 g/mol