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A student breaks a thermometer and spills most of the mercury (Hg) onto the floor of a laboratory that measures $15.2 \mathrm{m}$ long, $6.6 \mathrm{m}$ wide, and $2.4 \mathrm{m}$ high. (a) Calculate the mass of mercury vapor (in grams) in the room at $20^{\circ} \mathrm{C}$. The vapor pressure of mercury at $20^{\circ} \mathrm{C}$ is $1.7 \times 10^{-6}$ atm. (b) Does the concentration of mercury vapor exceed the air quality regulation of $0.050 \mathrm{mg} \mathrm{Hg} / \mathrm{m}^{3}$ of air? (c) One way to treat small quantities of spilled mercury is to spray sulfur powder over the metal. Suggest a physical and a chemical reason for this action.

(a) $3.4 \mathrm{g}$(b) $14 \mathrm{mg} \mathrm{Hg} / \mathrm{m}^{3}$ air; Yes, it exceeds the regulation.(c) Applying sulfur powder would cover the exposed surface area of Hg in contact with air which reduces the evaporation rate. Moreover, sulfur can react with Hg to form HgS which does not evaporate easily (negligible vapor pressure).\[\mathrm{Hg}(s)+\mathrm{S}(s) \longrightarrow \mathrm{HgS}(s)\]

Chemistry 101

Chapter 5

Gases

Drexel University

University of Maryland - University College

University of Kentucky

Lectures

05:03

In physics, a gas is one of the three major states of matter (the others being liquid and solid). A gas is a fluid that does not support tensile stress, meaning that it is compressible. The word gas is a neologism first used by the early 17th-century Flemish chemist J.B. van Helmont, based on the Greek word ("chaos"), the simplest of all the elemental forms of matter.

04:46

In physics, thermodynamics is the science of energy and its transformations. The three laws of thermodynamics state that energy can be exchanged between physical systems as heat and work; that the total energy of a system can be calculated by adding up all forms of energy in the system; that energy spontaneously flows from being localized to becoming dispersed, spread out, or uniform; and that the entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium.

05:23

A student breaks a thermom…

05:44

The vapor pressure of merc…

08:40

20:26

Mercury and many of its co…

03:05

Mercury is a liquid at roo…

03:52

When solid mercury(I) carb…

The volume of the rome is 15.2 15.2 multiply. 6.6 multiply, 2.4 meter cube 820 degrees celsius where the vapour pressure, the vapour pressure of mercury, is 1.7 multiply 10 raised to the power minus 6 standard atmospheric pressure. We need to find the flowing part, a mass of mercury vapour in the room part b, concentration, concentration of mercury in microgram, g per cum per cubic meter in air part c. I explanation: planation y sulphur powder is used to treat the spills for it. The spills calculations per a use, the ideal gas equation to find the number of moles of g, so n, is equal to p v out of r t. This is ideal. Gas equation is equal to. We have 1.7 multiply 10 raised to the power minus 6 standard. Atmospheric pressure into we have here, 15.2 multiply. 6.6 multiply 2.4 meter cube into 1000 kelvin divided by 11 meter cube divided by we have 0.0821 liter atmospheric pressure. Mole per mole per kelvin into 20 plus 273 kelvin cancel with this 1 cancel with this 1 this 1. So we have here: n is equal to 0.0170 mole of mercury use. The molar mass use the molar mass of mercury to find the mass to find the mass mass of mercury is equal to 0.0170 mole into 2. Double 0.59 gram divided by 1. Mole is equal to 3.4 gram, part the concentration of mercury, the concentration of mercury in microgram, microgram g out of meter, cube air is or is, m g. A g m cube air is equal to. We have 3.41 gram into 1000. Gram divided by 15.2. Multiply. 6.6. Multiply 2.4 meter cube is equal to 14 microgram. Mercury per cubic meter air, so, yes, it exceeds exceeds the air quality, the air quality quality or regulation gulation of 0.050 h g cubic meter, part c. We have applying applying sulphur powder. Sulphur powder would cover the exposed for the exposed surface, surface area of area of mercury in contact with air which reduces the weight, reduces the e operation. Ration red more or more or sulphur can react. Sulphur can react with mercury with mercury to form to form g s which does not with does not does not evaporate flowrate easily negligible vapour pressure. Ligibal vapour pressure, the mercury plus in solid state plus sulphur in solid state is equal to h g s also in solids.

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