6 volumes of helium diffuses pinhole in 10s. Equal volume if unknown gas diffuse 40s. Find molar mass of unknown gas? How to calculate this?​

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?

Asolid that forms and separates from a liquid mixture is called

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false