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Chemical Calculations: The Mole and Avogadro's Number

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Chemical Calculations: The Mole and Avogadro's Number

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Questions and Answers

What is the unit of moles for pure solids, liquids, and gases?

Moles (correct)

Liters

Grams

Meters

How is the molar mass (Mr) of a compound calculated?

By multiplying the atomic masses of each element in the compound

By dividing the molecular weight by the number of atoms

By adding up the mass numbers of each element (correct)

By subtracting the mass numbers of each element

How many grams make 1 kilogram?

750 grams

1000 grams (correct)

500 grams

2000 grams

What is Avogadro's constant used for?

Determining the number of particles in a mole of substance Signup and view all the answers

In density calculations, what units are usually used?

Grams per cubic centimeter Signup and view all the answers

What is the significance of Avogadro's constant?

It defines the number of particles in one mole of a substance Signup and view all the answers

What is Avogadro's Number?

6.022 x 10^23 atoms in 12 grams of carbon-12 Signup and view all the answers

What is the definition of relative atomic mass?

The average mass of one atom compared to one twelfth of the mass of one atom of carbon-12 Signup and view all the answers

In chemical calculations at A-level, what is the unit of pressure (P) used in the gas equation PV = nRT?

Pa Signup and view all the answers

Which equation is used for converting moles to mass?

$ ext{moles}= rac{mass}{Mr}$ Signup and view all the answers

What is the value of the gas constant R in most calculations?

$8.31$ Signup and view all the answers

When converting temperature from degrees Celsius to Kelvin, what value should be added?

$273$ Signup and view all the answers