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Answer:
25.3%
Step-by-step explanation:
Since
Ca has just 1 mole
Ca ×1 = 40.08
C has 4 moles
C×4 = 48.04
H has 6 moles
H×6 = 6.06
O has 4 moles
O×4 = 64
64+6.06+48.04+40.08=158 (approx.)
40.08÷158 ×100% = 25.3%