Where does the 3 in the 3h2o come from and where did the 3 subscript in the question goto from h3po4

3h2o-li3po4

#1

h3po4 + 3lioh

answer is 3h2o +li3po4

where does the 3 in the 3h2o come from and where did the 3 subscript in the question goto from h3po4. it does add up to me because i count 3 atoms from the subscript and 3 coeeficient from the oh.

Answer:

The coefficient 3 in front of H20 comes from balancing the equation. Without that 3, you will have 6H with 3O on the reactant side; and you will only have 2H with 1O on the product side. With the addition of the coefficient, you will have 2H+2H+2H=6H and 1O+1O+1O=3O.

There is a subscript 3 on Li bc PO4 is a polyatomic ion with a -3 charge. Li ion has a +1 charge bc it is a Group 1 element. Remember to always have a neutrally charged (=zero) compound, so you’d need 3 Li (+1x3=+3) to cancel out the -3 from the PO4. Subscripts on elements are used to have neutral compounds whereas coefficients are used to balance equations.

The coefficient 3 in front of H20 comes from balancing the equation. Without that 3, you will have 6H with 3O on the reactant side; and you will only have 2H with 1O on the product side. With the addition of the coefficient, you will have 2H+2H+2H=6H and 1O+1O+1O=3O.

There is a subscript 3 on Li bc PO4 is a polyatomic ion with a -3 charge. Li ion has a +1 charge bc it is a Group 1 element. Remember to always have a neutrally charged (=zero) compound, so you’d need 3 Li (+1x3=+3) to cancel out the -3 from the PO4. Subscripts on elements are used to have neutral compounds whereas coefficients are used to balance equations.