Use the given thermodynamic data to determine the change in enthalpy for the following reaction:
KOH (s) + HNO3 (g) KNO3 (s) + H20 (9)
->
Compound
KOH (s)
HNO3 (g)
KNO3 (s)
H2O (9)
AHF (kJ/mol)
-425
-188
-486
-242
kJ/mol

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

the answer is definitely c.

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .