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1) That looks right. 2) Step 1: Moles=Mass/Mr, so it's 144/72= 2mol. Step 2: Stoichiometry means the ratio of oxygen to pentane is 1:8 so moles of oxygen is moles of pentane times 8. 2*8=16mol of oxygen. Step 3: 16= 9.6*10^24. 3) The ratio of oxygen to carbon in CO2 is 1:2. so it's 192/3 = 64.
Best Answer: Relative Formula Mass(MgSO4 (anh)) = 24.3 + 32 + 64 = 120.3 Moles MgSO4 (anh)) = 1.654/120.3 = 0.013749 moles Moles H2O = 1.574/18 = 0.0874444 moles Mole Ratio moles H20/ moles MgSO4 (anh)) = 0.0874444/0.013749 = 6.36: 1 Should have been very close to 7.est Answer: Relative Formula Mass(MgSO4 (anh)) = 24.3 + 32 + 64 = 120.3 Moles MgSO4 (anh)) = 1.654/120.3 = 0.013749 moles Moles H2O = 1.574/18 = 0.0874444 moles Mole Ratio moles H20/ moles MgSO4 (anh)) = 0.0874444/0.013749 = 6.36: 1 Should have been very close to 7.