Answer:
The answer to your question is Mg loses its valence electrons and acquire a positive charge (Mg⁺²).
Explanation:
Valence electrons are important for an element to attach to another one, metals lose these electrons while nonmetals gain electrons to complete the octet rule.
Magnesium is a metal that loses these electrons so when it becomes an ion Magnesium will have a positive charge Mg⁺².
Answer:
It is A) Calcium
Explanation:
Calcium has an electronic configuration of 2,8,8,2
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0.72 mole of oxygen would produce 320.4 kJ of heat.
<u>Explanation:</u>
CH₄ (g) + 2O₂ (g) → CO₂ (g) + 2H₂O (ℓ) + 890kJ
According to the equation,
2 moles of O₂ produces 890 kJ of heat
So, 0.72 moles of O₂ will produce:

Therefore, 0.72 mole of oxygen would produce 320.4 kJ of heat.
Answer:
656.25 mL
Explanation:
M1 = 0.40 M
M2 = 1.50 M
V2 = 175 mL
Plug those values into the equation:
M1V1 = M2V2
(0.40)V1 = (1.50)(175)
---> V1 = 656.25 mL