To complete the following chemical equation, what coefficients must be added? ca(oh)2 + h3po3 yields ca3 (po3)2 + h2o

The numerical coefficients are needed in order to complete the chemical reaction by balancing. Balancing is done by equating the number of atoms/elements on both sides of the chemical reaction. In this item, the balanced chemical reaction is,

   3Ca(OH)2 + 2H3PO3 --> Ca3(PO3)2 + 6H2O

The numerical coefficients are 3, 2, 1, and 6. 

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Answer accretion;