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# which sequence of coefficients will balance the following equation? Ca(s) +O2 (g) ? 2CaO (s)?

which sequence of coefficients will balance the following equation? Ca(s) +O2 (g) ? 2CaO (s)?a. 2,1,2 b. 1,1,2 c. 3,1,2 d. 4,1,2