Calculate the number of moles of 25grams of ammonia (NH3)
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Molar mass : Mass of the one mole of the substance is called molar mass.
Molar mass is numerically equal in g(gram) to atomic mass in u(unified mass).
Molar mass of the NH3.
= 14g + (1×17)g.
= 31g/mol.
Mass = number of moles × molar mass.
25 = number of moles × 31
25×31/17 = number of moles.
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