Defined the following with an example of two balanced chemical equation where possible 1 Standard heat of neutralization 2 Heat of hydrogenation 3 Standard heat of combustion? ?

1. Standard heat of neutralization: The standard heat of neutralization is the heat released or absorbed when one mole of water is formed from the reaction between an acid and a base.

Example:
HCl(aq) + NaOH(aq) -> NaCl(aq) + H2O(l) ΔH = -57.3 kJ/mol

2. Heat of hydrogenation: The heat of hydrogenation is the heat released or absorbed when one mole of hydrogen gas is added to a compound.

Example:
C2H4(g) + H2(g) -> C2H6(g) ΔH = -136.2 kJ/mol

3. Standard heat of combustion: The standard heat of combustion is the heat released or absorbed when one mole of a substance is completely burned in oxygen.

Example:
C6H12O6(s) + 6O2(g) -> 6CO2(g) + 6H2O(l) ΔH = -2803 kJ/mol

1. Standard Heat of Neutralization

- Definition: The amount of heat released or absorbed when one mole of an acid is neutralized by one mole of a base in dilute aqueous solution under standard conditions (298 K and 1 atm).

- Example:
```
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
ΔH° = -56.2 kJ/mol
```

2. Heat of Hydrogenation

- Definition: The amount of heat released when one mole of a double bond (C=C) is converted to a single bond (C-C) through the addition of hydrogen gas.

- Example:
```
H2C=CH2(g) + H2(g) → CH3CH3(g)
ΔH° = -126.5 kJ/mol
```

3. Standard Heat of Combustion

- Definition: The amount of heat released when one mole of a substance reacts completely with oxygen under standard conditions (298 K and 1 atm).

- Example:
```
CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)
ΔH° = -890.4 kJ/mol
```

the following financial data are  extracted from dasa manufacturing business for the further quarter october,november,december 2023
  A) standard financial data
1.September 2023 ending inventory cost 150000 birr
2.each month ending  inventory cost 3/4 of beginning inventory
3.the further expected to sales and gross profit are 960000 birr and 360000 birr
4.the contribution of each month is into 1:2:3 ratio respectively
B) actual performance data
1. Sold unit price are 6000,6500,7000 a) 35,34,33 birr respectively
2.the frist month beginning and ending inventory cost 190000 and 130000 birr
3. The gross profit is 40% of at sales volume in each month
4.the last two month ending inventory cost are 140000 and 135000 birr respectively
Based on above data compute variance in each item.