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Which of the following chemical equations adhere to the law of conservation of mass? Copy and balance those that do not. (a) H2(g) + O2(g) → H2O(g) (b) 2 NaOH(aq) + Cu(ClO3)2(aq) → Cu(OH)2(s) + 2 NaClO3(aq) (c) Pb(s) + AgNO3(aq) → Ag(s) + Pb(NO3)2(aq) (d) 2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(l)

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2H2(g) + O2(g) → 2H20(g) B is balanced Pb(s) + 2AgNO3(aq) → 2Ag(s) + Pb(NO3)2(aq) D is also balanced
thank you! for 2NaOH, are there 2 Na and 2 OH ?

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Numbers before a compound indicates amount of the whole compound, numbers after a molecule indicate the number of those molecules per number of the compound
okay, thanks a lot!

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