HELP!

Which of the following statements in incorrect?

a. One mole of ozone, O3(g), has a mass of 48.0 g.

b. One mole of methane, CH4(g), contains 6.02 x 1023 carbon atoms.

c. 12.01 g of carbon has the same number of atoms as 12.01 g of nitrogen.

d. One mole of a substance is the amount of the substance that has the
same number of entities as 12.00 g of carbon-12.

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.

How many liters of 3.0 m naoh solution will react with 0.60 liters of 4.0 m h2so4? h2so4 + naoh → na2so4 + h2o 1.2 l 1.6 l 2.4 l 2.8 l