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2) a. mr C11H22O11 = 12x11 + 1x22 + 16x11
= 132+22+176=330
b. mr CH3COOH = 12x2 + 1x4 + 2x16
= 24+4+32=60
c. mr Al2(SO4)3 = 27 + 3(32+4x16)
= 27 + 3x96
= 27 + 288 = 315
d. mr Ca(NO3)2. 3H2O = 40 + 2(14+3x16) + 3(1x2 + 16) = 40 + 124 + 54 = 218

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