Chemistry

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I am having some difficulties balancing the following equations:

Cr2O3(s)+CO(g)->Cr(s)+CO2

Ca(OH)2(aq)+Na3PO4(aq)->Ca3(PO4)2(s)+NaOH(aq)

Sb2S3(s)+O2(g)->Sb2O3(s)+SO2(g)

  • Chemistry -

    Cr2O3(s) + 3CO(g)->2Cr(s) + 3CO2

    3Ca(OH)2(aq) + 2Na3PO4(aq) -> Ca3(PO4)2(s) + 6NaOH(aq)

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