1.2 Amount of substance Flashcards Preview

Chemistry AS 2015-16 > 1.2 Amount of substance > Flashcards

Flashcards in 1.2 Amount of substance Deck (10)
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1

What is the definition of relative atomic mass?

The average mass of one atom of an element divided by 1/12 mass of one atom of C-12

2

How many atoms are there in three moles of potassium?

1.8066x1024 (3x6.022x1023)

3

What is the ideal gas equation?

pV=nRT

4

A compound of aluminium and oxygen is made up of 52.9% aluminium by mass. What is its empirical formula?

Al2O3

5

Write a balanced equation to produce aluminium oxide from aluminium and oxygen

4Al+3O2→2Al2O3

6

What is the atom economy of the production of calcium oxide(CaO) from calcium carbonate(CaCO3)?

56%

7

If the empirical formula of a compound is C4H7Br2 and the Mr is 1074, what is the molecular formula?

C20H35Br10

8

How do you convert cm3 to dm3?

÷1000

9

How do you find the Mr of a sample if you have its mass and moles?

Mass÷Moles=Mr

10

How do you convert °C to K?

Add 273 from the °C value