Question: How can I calculate the molar mass of 2NH3, do I have to use the big 2 in front of this compound or any compound I may come across? So the density depends only on the molar mass. If you have 17 g NH3 in 1000 ml H2O, you have a 1M NH3. Hint: Think about the Molar Volume at STP, & Molar Mass. The molecular weight of NH3 is 17 g (N=14 plus 3H=3). In this case, you know that ammonia, NH3 , is composed of. The ammonia solution (NH3) of 25% means 25 gr NH3 in 100 ml water. Elemento Símbolo Peso atómico Atomos ... Masa equivalente (peso molar ) es la masa de un mol de una sustancia y se expresa en g / mol. A) N2O4 < Ar < F2 < NH3. Massa molar of NH3 is 17.03052 ± 0.00041 g/mol Convert between NH3 weight and moles C) F2 < Ar < N2O4 < NH3. It would be better if [math]2NH_3[/math] or 2 NH[math]3[/math]worked. Now, we can use our molar mass, which is 17.03 grams per mole of NH3, because I need to make sure all my units are cancelling out. The percentage by weight of any atom or group of atoms in a compound can be computed by dividin B) Ar < N2O4 < F2 < NH3. Explanation: To determine the molar mass of any compound, all you have to do is add up the molar masses of every atom that makes up the respective compound. 17.03052 g/mol . The molar volume is the same for all gases. F2 NH3 N2O4 Ar? Favorite Answer. Molar mass of ammonia = (14.01 + 3.03) (Molar mass of nitrogen + 3 times molar mass of hydrogen, as chemical formula of ammonia is NH3). Compuesto: Moles: Peso Atómico, g: NH3: Composición elemental de NH3. Masa molar of NH3 is 17.03052 ± 0.00041 g/mol Convertir entre NH3 pesos y moles. This structure means that the ammonia molecule has a triangular middle shape to it. So, I see molecule cancelling out with molecules, moles cancels with moles, and the units I'm left with are grams of NH3, and so when I do the calculation, what I end up with is 141 grams of NH3.