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a) 3 KNO3
N: 3 * 14g = 42g
b) 10 Ca(NO3)2
N: 10 * 2 * 14g = 280g
2.
a) 1 mol = 22,4 dm3
b) 22 g N2:
28 g ---- 22,4 dm3
22 g ---- x
x = 22*22,4/28 = 17,6 dm3