Balance the following equation in an ACID SYSTEM.

Ca (s) + HNO3 (aq) ==> Ca(NO3)2 (aq) + NO (g)

What coefficent is placed in front of H2O in the final combined balanced equation?
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2HNO3+Ca(OH)2= Ca(NO3)2+2H2O

Explanation:

In this equation, you have to balance the atoms of both sides, so you start with one type of atom and go from there.

Since Oxygen has more atoms in the equation, let's try to balance them first and see if that works.

Currently, I have 5 total O atoms (3 + 2) on the left side and 7 on the right (6 + 1)

Since they are not balanced, I need to put something on the left to give more on that side.

Try 2 HNO3, which gives 6 O atoms, and I had 2 from the Ca(OH)2 already, so I have a total of 8 O atoms now.

Right side, you need 8 total, but only have 7.  Since H20 has only one O atom, if you place a 2 in front of the H20, you have 2 O atoms now.

Equation so far:

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

Again, balance all the atoms for reactants and products.

Reactants:

2HNO3 has 2 H atoms, 2 N atom and 6 O atoms

Ca(OH)2 has 1 Ca atom, 2 O atoms and 2 H atoms

Left side: 4 H atoms, 2 N atoms, 8 O atoms, 1 Ca atom

Products:

Ca(NO3)2 has 1 Ca atom, 2 N atoms, 6 O atoms

2H2O has 4 H atoms (2 x 2), and 2 O atoms

Right side: 1 Ca atom 2 N atoms, 8 O atoms, 4 H atoms

Since the numbers on the left equal the right, you now have a balanced equation, so this must be the

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

put the answers   and i could answer.

the temperature of the gas, in k, not celsius.