Question

how much mercury is in this sample?
hg²⁺ + 2ki → hgi₂ + 2k⁺
ratio 1 2 → 1 2
moles moles? ? → 0.000002568 ?
mass ? 0.005 g → 0.001167 g ?
now that we know the moles of hgi₂, we can use the ratio in the balanced chemical equation to determine the moles of hg²⁺ (the mercury in the hair sample). we need to complete this step because after we know the moles of hg²⁺, we can then convert it to find the grams of mercury in the sample.
based on the ratios in the chemical equation above, if there are 0.000002568 moles of hgi₂, there will be moles of hg²⁺

Explanation:

Step1: Determine the mole ratio

The balanced chemical equation shows that the mole ratio of \(Hg^{2 +}\) to \(HgI_{2}\) is \(1:1\).

Step2: Calculate the moles of \(Hg^{2+}\)

Since the mole ratio of \(Hg^{2 +}\) to \(HgI_{2}\) is \(1:1\), and the moles of \(HgI_{2}\) is \(0.000002568\) moles.
So, moles of \(Hg^{2+}=0.000002568\) moles

Answer:

\(0.000002568\) moles