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**Moles, volume and density**

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Calculate the volume of a given mass of a gaseous substance from its density at a given temperature and pressure. Include: molar volume calculation Solve problems requiring interconversions between moles, mass, volume, and number of particles. Additional KEY Terms STP

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Avogardo ( ) Avogadro’s Hypothesis - any sample of any gas at the same temperature and pressure will contain the same number of particles.

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**Chemists use a standard temperature and pressure, STP, to measure gas volumes.**

0°C and kPa At STP: The volume of 1 mole of ANY GAS is 22.4 L. 22.4 L/mol is known as molar volume. The MASS of 22.4 L of any gas is equal to the molar mass for that gas.

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**How many moles are in 50.0 L of Fluorine gas at**

STP? F2 = 36.0 g/mol 50.0 L 22.4 L 1 mol = mol

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**What is the STP volume of 10.0 g of Methane gas?**

CH4 = 16.0 g/mol 10.0 g 16.0 g 1 mol 1 mol 22.4 L = L

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**Density: A physical property that describes the mass per unit volume of a substance.**

grams (g) per litre grams per mL (or cm3)

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**Calculate the volume, in litres, of one mole of**

ammonia (NH3) at room temperature if the density is g/L. NH3 = 17.0 g/mol 1 mol 1 mol 17. 0 g 0.696 g 1 L = L

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Calculate the volume, in litres, of two moles of carbon dioxide, at room temperature, when the density is 1.80 g/L. CO2 = 44.0 g/mol 2 mol 1 mol 44. 0 g 1.80 g 1 L = L

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· STP: 0°C and kPa (1 atm) · At STP, the molar volume of any gas is 22.4 L · Molar mass = total grams in 1 mole (g/mol) · 1 mole = 6.02 x 1023 particles (Avogadro) · density of a substance = mass per volume (g/L) * All roads lead to moles (convert to moles first).

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CAN YOU / HAVE YOU? Calculate the volume of a given mass of a gaseous substance from its density at a given temperature and pressure. Include: molar volume calculation Solve problems requiring interconversions between moles, mass, volume, and number of particles. Additional KEY Terms STP

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