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Module 2 Chemistry > Calculations > Flashcards

Calculations Flashcards

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1
Q

What equation should be used to find the number of moles if you have the mass and Mr?

A

moles=mass/Mr

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2
Q

How do you find the Mr?

A

Add up all of the Ar’s in the compound.

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3
Q

How do you find the number of moles if you have volume and concentration?

A

moles= volume X concentration

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4
Q

What are the units for moles?

A

mol

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5
Q

What are the units for mass?

A

g

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6
Q

What are the units for Mr?

A

gmol^-1

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7
Q

What are the units for concentration?

A

mol dm^-3

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8
Q

What are the units for volume in the moles and centration equation and in the moles and volume, 24 e

A

dm^3

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9
Q

How do you get from cm3 to dm3?

A

/1000

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10
Q

What is the equation for moles if you know only the volume?

A

moles=volume/24

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11
Q

What conditions are required for the following reaction: moles=volume/24?

A

RTP

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12
Q

What is the ideal gas equation?

A

pV=nRT

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13
Q

In the ideal gas equation, what does R stand for?

A

Gas constant

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14
Q

What is the value of R in the ideal gas equation?

A

8.314 Jmol^-1k^-1

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15
Q

What does n stand for in the ideal gas equation?

A

Number of moles.

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16
Q

What are the units for p in the ideal gas equation?

A

Pa

17
Q

What are the units of V in the ideal gas equation?

A

m^3

18
Q

What are the units of T in the ideal gas equation?

A

K

19
Q

How do you get from C to K?

A

+273

20
Q

How do you get from KPa to Pa?

A

x10^3

21
Q

How do you get from cm^3 to m^3?

A

x10^-6

22
Q

How do you get from dm^3 to m^3?

A

x10^-3

23
Q

How do you find the percentage yield?

A

(actual yield/ theoretical yield) x100

24
Q

How do you find the atom economy?

A

(sum of molar masses of desired products/ sum of molar masses of all products)x100

25
Q

How do you find the water of crystallisation?

A

Calculate the number of moles of anhydrous compound present.
Calculate the moles of water produced.
Find the simplest whole number ratio.

26
Q

How do you calculate the mass of product formed?

A

Find the moles of reactant.
Find the moles of product formed using ratios.
Calculate the mass of product formed.

27
Q

How do you calculate the theoretical yield?

A

Using ratios (for product)

28
Q

How do you calculate the actual yield?

A

By using the relevant mathematical equations.

29
Q

How do you find the empirical formula from mass?

A

Find the number of moles.
Divide by the smallest.
Multiply for whole numbers.

30
Q

How do you find the molecular formula?

A

Find the empirical formula.
Find the relative mass.
Divide the relative molecular mass by relative formula mass.
Multiply the empirical formula by the result of the previous step.

Module 2 Chemistry (4 decks)

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