[jmg808]

How do you do this problem: A 2.710 g sample contains some CaCl2, which is inert to HCl(aq) and also some CaO,
which reacts:  CaO(s)  +  HCl(aq)    →   CaCl2 (aq) + H2O(l).   It took 32.05 mL of
2.445 molar HCl(aq) to react completely with all the CaO in the sample.  The percent,
by weight, of CaO in the sample is

[Borek]

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Start calculating mass of CaO from the reaction equation.