\(a,PTK_{SiO_2}=28+16\cdot2=60\left(đvC\right)\\ b,PTK_{PH_3}=31+3=34\left(đvC\right)\\ c,PTK_{AlCl_3}=27+35,5\cdot3=133,5\left(đvC\right)\\ d,PTK_{Ca\left(OH\right)_2}=40+\left(16+1\right)\cdot2=74\left(đvC\right)\)
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