The eruption of Mount st Helens on May 18 1980, provided geologists with a uniqu

Question

The eruption of Mount st Helens on May 18 1980, provided geologists with a unique opportunity to study the action of volcanos. Gas samples from the plume were collected and analyzed for toxic heavy metals. To collect mercury, Hg gas samples were passed overa a piece of gold metal which binds Hg atoms very tightly. The mass of the metal increased as it absorbed Hg from the plume gas sample containing 200.0 g of ash, 360 mug, of Hg was deposited on the gold.If 35 metric ions of ash were deposited per in the Yakims valley, determine how much grams H_g the volcanp deposited on every acre in grams, moles and number of atoms (1metric lon = 1000 kg).

Explanation / Answer

For 200 gms of ash 3.6 ug of Hg was deposited

1 metric ton = 1000 Kg = 10^6 gms

35 metric tons = 35*10^3 Kg = 35*10^6 gms of ash

For

35*10^6 gms of ash = 3.6*10^-6 *35*10^6 / 200 = 0.63 gms of Hg /acre

First answer is 0.63 gms/acre

b]

Molar mass of Hg = 200.59 gm/mol

Moles =0.63 / 200.59 = 3.14*10^-3 moles/acre

c]

1 mole contains 6*10^23 atoms

3.14*10^-3 mole contains 6*10^23*3.14*10^-3 = 1.89*10^21 atoms of Hg /acre

Answer is 1.89*10^21 atoms/acre

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