What volume of Argon gas (at STP) is equal to 2.40 grams of Argon?

What substance has a mass of 9.5g and volume of 2.1cm^3

Increasing the substrate concentration in an enzymatic reaction could overcome which of the following? a) the need for a coenzymeb) allosteric inhibitionc) competitive inhibitiond) insufficient cofactors

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.