How many grams of NH3 are needed to get the same number of molecules as in sample S ?
Answers
Answer:
The molar mass or molecular weight of a compound is how much 1 mole of a compound weighs. It is usually expressed as g/mol and can be easily calculated given the chemical formula of the compound. The molar mass of a compound is very important as that is what allows the conversion from mass to moles. The number of moles is an important quantity since chemical reactions occur at specific molar ratios.
Amount of NH3 in g = 0.0867 g
Explanation:
Molecular mass of SF_6 = 146.06\;g/molSF
6
=146.06g/mol
Mole = \frac{0.75\;g}{146.06\;g/mol}=0.0051\;molMole=
146.06g/mol
0.75g
=0.0051mol
0.0051 mol has same no. of molecules in both NH3 and SF6.
Amount of NH3 in g = Mole × Molar mass
Molar mass of NH3 = 17.00 g/mol
Amount of NH3 in g = 0.0051 × 17.00
= 0.0867 g