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Given the two chemical equations, circle the one that is balanced.

a.) 2Na + Cl2 → 2NaCl
b.) 2Na + 2Cl2 → 2NaCl

a.) C3H8 + 502 — 3CO2 + 4H2O
b.) 2C3H8 + 502 → 3CO2 + 8H20