Asample of nitrogen gas is contaminated with a gas (gas a) of unknown molar mass. the partial pressure of each gas is known to be 200 torr at 25°c. the gases are allowed to effuse through a pinhole, and it is found that gas a escapes 2.65 times the rate of nitrogen gas. what is the molar mass of gas a?

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

What are the chemical names of these compounds? ke: mg3n2: reset next

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.