ionic compounds lose or gain electrons to become stable.
ionic compounds are bonds between metals and nonmetals.
molecular or covalent compounds share one or more electrons to become stable.
molecular or covalent compounds are bonds between nonmetals.
Solution:
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol.
Therefore,
Latice Energy: K⁺(g) + NO₃⁻(g) → KNO₃(s) . . . ∆H = –163.8 kcal/mol
Hydration:
K⁺(g) + NO₃⁻(g) + excess H₂O → K⁺(aq) + NO₃⁻(aq) . . . ∆H = –155.5 kcal/mol
Flip the first equation and add them together:
KNO₃(s) + excess H₂O → K⁺(aq) + NO₃⁻(aq) . . . ∆H = +8.3 kcal/mol = +34. 73 kJ/mol
(110kJ)/(34. 73 kJ/mol) = 3.16729 mol must be dissolved to absorb 110 kJ
The formula that denotes the incomplete combustion of carbon in the presence of a limited amount of oxygen is <span>2 C + O</span>₂<span> → 2 CO
If the mass of oxygen that is used to combust carbon is 35 g
then the moles of oxygen = mass of oxygen </span>÷ molar mass of oxygen
= 35 g ÷ 32 g/mol
= 1.0938 mol
Now, the mole ratio of oxygen : carbon monoxide based on the balance equation is 1 : 2
⇒ If the mole of oxygen = 1.0938 mol
then the mole of carbon monoxide = 1.0938 × 2
= 2.1876 mol
Mass of CO is = mol of CO × molar mass of CO
= 2.1876 mol × 28 g/mol
= 61.25 g
∴ when a certain mass of carbon is combusted in 35g of oxygen then it produces approx. 61.25 g of Carbon Monoxide.
Answer: A
Explanation: A is the answer