What is the pressure inside a container of 3 moles of gas with a volume of 60 Liters at a temperature of 400 K?

1 answer:

4 0

1.64 atm

PV = nRT —> P = nRT / V

n = 3 moles
R = 0.08206 L atm / mol K
T = 400 K
V = 60 L

P = (3)(0.08206)(400) / 60 = 1.64 atm

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if 28.5 g of calcium hydroxide is dissolved in enough water to make 185g of solution what is the percent by mass of calcium hydr

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The percent by mass of calcium hydroxide in the solution : 15.41%

<h3>Further explanation</h3>

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

Mass of solute (Ca(OH₂-Calcium hydroxide) : 28.5

Mass of solution = 185 g

$\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%\\\\\%mass=\dfrac{28.5~g}{185~g}\times 100\%\\\\\%mass=15.41\%$