Aneutron star has more mass then what and is about the same size as what?

What is the final velocity of the initial velocity of 25 and -50?

The molecular mass of a gas is (select all that apply) a. independent of the type of gas b. the same number as the atomic (or molecular) mass, but measured in grams c. dependent on the temperature d. the mass of a mole of the gas

Can anyone plz answer any of these. even if its one it will