CHEMISTRY:There are 9 rotons & 11 neutrons. What is the atomic number & atomic mass?

A) The atomic number is 9 & the atomic mass is 19

B) The atomic number is 9 & the atomic mass is 20

C) The atomic number is 11 & the atomic mass is 19

D) The atomic number is 11 & the atomic mass is 20

Acompound is found to contain 6.1% hydrogen and 93.9% oxygen. find it’s empirical formula.

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

What is the effect of returning nuclear reactor cooling water back into bodies of water?