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Mole Concept and Avogadro's Number

What is the d...

Question

What is the density of bromine vapor at STP?

2.5

g/L

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2.9

g/L

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3.6

g/L

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4.9

g/L

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7.1

g/L

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Solution

The correct option is E $7.1$ g/L
The molecular weight of bromine is 159.8 g/mole.
$P V = n R T$

$P V = \frac{w}{M} R T$

$P M = \frac{w}{V} R T$

$P M = ρ R T$

Density $ρ = \frac{P M}{R T}$

Density $ρ = \frac{1 \times 159.8}{0.08206 \times 273} = 7.1 g / L$
STP conditions corresponds to a pressure of 1 atm and temperature of 273 K.

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