Which coefficient correctly balance the equation cao + h2o -> ca(oh)2 -1; 2; 3 -1; 1; 1 -2; 1; 2 -1; 2; 1

For the equation that we are given:

→

We see that on the reactants side we have:

Ca: 1 mol

O: 2 mol

H: 2 mol

And then we see that on the products side we have:

Ca: 1 mol

O: 2 mol

H: 2 mol

Therefore since we have equal moles of each of the elements on both sides of the equation, this equation is balanced how it is.

So the correct coefficients for this equation are: B) 1, 1, 1.