Cao+2hno3 =

CaO + 2HNO3 = Ca(NO3)2 + H2O

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To balance the chemical equation Cao + 2HNO3, we need to make sure that the number of atoms of each element is the same on both sides of the equation. Here's how we can do it:

1. Start by writing the unbalanced equation: Cao + 2HNO3.

2. Let's balance the first element, calcium (Ca). There is one calcium atom on the left side and none on the right side. To balance it, we put a coefficient of 1 in front of CaO on the left side.

CaO + 2HNO3

3. Next, let's balance the second element, nitrogen (N). There are two nitrogen atoms in HNO3 on the right side, and none on the left side. To balance it, we put a coefficient of 2 in front of HNO3 on the left side.

CaO + 2HNO3

4. Finally, let's balance the third element, oxygen (O). There is one oxygen atom in CaO on the left side and three oxygen atoms in HNO3 on the right side. To balance it, we need to add a coefficient of 3 in front of CaO.

3CaO + 2HNO3

The balanced chemical equation is 3CaO + 2HNO3.