Answer:
0.010 $.
Explanation:
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In this case, since 1 troy ounce equals 31.1 grams, we can compute the price of gold per gram first:
Now, we need to compute the grams of copper in 5.17 x10¹⁷ atoms via the Avogadro's number:
Thus, the price is:
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X=107 because the sides of a hexagon must add up to 720
multiply by (6.02 times 10^23 atoms)/(1mole, cancel out atoms)
Answer is: a. Mg + 2HCl → H₂ + MgCl₂.
Reduction hald reaction: 2H⁺ + 2e⁻→ H₂.<span>
Oxidation half reaction: Mg</span>⁰ → Mg²⁺ + 2e⁻.
In this chemical reaction, magnesium lost two electrons (oxidation, change oxidation number from 0 to +2) and hydrogen gain that two electrons (reduction, change oxidation number from +1 to 0).
