Is the number of moles of a gas equal to the mass divided by the molar mass true or false ?

Over the last 90 years, scientists have added to the body of evidence supporting the big bang theory. what is the latest piece of evidence discovered in 2014?

Which metal exist in liquid state and can be cut with knife ?

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments