Question

hg²⁺ + 2ki → hgi₂ + 2k⁺
ratio 1 2 → 1 2
moles 0.000002568? → 0.000002568?
mass mass? 0.005 g → 0.001167 g?
now we know that there are 0.000002568 moles of hg²⁺ in the sample. although this does help us quantify how much mercury is in the sample, to compare it to the safety guidelines well need to know the mass of mercury in the sample.
based on the molar mass of mercury, how many grams is 0.000002568 moles of hg²⁺?
the molar mass of hg²⁺ mercury 200.59 grams / 1 mole

Explanation:

Step1: Use the formula \(m = n\times M\)

Where \(m\) is mass, \(n\) is the number of moles, and \(M\) is molar mass. Given \(n = 0.000002568\) moles and \(M=200.59\) g/mol.

Step2: Calculate the mass

\(m=0.000002568\times200.59\)

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Answer:

\(0.000515\space g\)