Chemical calculations

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15 Terms

1

How do you calculate relative atomic mass of an atom?

Ar= (mass number x abundance)+(mass number x abundance)/ abundance+abundance

OR

Ar= total mass of atoms/total number of atoms

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2

How do you find the relative formula mass?

Add up all of the relative atomic masses

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3

What is Avogadro's constant?

6.02×10²³

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4

What is the calculation for moles (mol)?

Moles= mass/relative formula mass

OR

n=m/Mr

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5

What is meant by a limiting reagent

The reactant that gets consumed first in a chemical reaction and therefore limits how much product is made

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6

What is titration?

A technique used to find the concentration of an uknown solution

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7

What is the equation for percentage yield?

Actual yield/theoretical yield

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8

Why is percentage yield less than 100%?

  • Not all reactants react

  • Side/unwanted reactions may take place

  • Lost during completion e.g. filtering

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9

What is the equation for atom economy?

Mr of desired products/sum of Mr

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10

What is the volume of 1mol of gas?

24dm³ or 24,000cm³

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11

What is the calculation for mass/moles?

Mass/moles = concentration x volume

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12

How do you convert dm³ to cm³?

x 1000

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13

How do you convert cm³ to dm³ ?

÷1000

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14

How do you convert mol/dm³ to g/dm³ ?

x by Mr of the reactant

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15
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