Hello, Nskdbfk,
Is the NH3 a gas? If so, may we assume at STP?
If the answers are yes to both these questions, then we can convert the liters NH3 into moles NN3 with the conversion factor of (22.4 liters/mole gas). This conversion holds true for any gas at STP. Now we can calculate moles NH3 by dividing actual liters by the 22.4 liters/mole to get 0.216 moles.:
Molarity is moles/liters, so 0.216 moles/2 liters = 0.108 M (0.1 M with 1 sig fig due to the 2 liter number. Is a decimal point missing from the 2 liters?).
I'm unclear as to the basis for percentage. Is this volume/volume? Or mass/mass?
Mass percentage would be grams NH3 per grams water. 0.216 moles of NH3 is (0.216 moes)*(17 grams NH3/mole NH3) = 3.67 grams NH3. The total mass of the final solution would be (2000g + 3.67g = ) 2003.7g. Mass percentage would therefore be 3.67/2003.7 = 0.18%. (0.2% with 1 sig fig).
I made several assumptions, so please check carefully,
Bob
