Flashcards in 5 - Formulae, Amounts Of Substance Deck (12)

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1

Q

What’s avogadros constant?

A

6.02 x 10^23

2

Q

What is the R constant

A

8.314

3

Q

What is the ideal gas equation?

A

PV = nRT

4

Q

Calculating moles?

A

mass / rfm (molar mass)

5

Q

Moles/ rfm/ mass triangle?

A

mass on top! moles and rfm on bottom

6

Q

Unit for pressure?

A

Pascals (pa) 1kpa = 1000pa

7

Q

Unit for volume?

A

m^3

8

Q

Converting from degrees centigrade to Kelvin?

A

+ 273

9

Q

Using empirical formula?

A

divide the mass by the rfm for all given elements

if the ratio is clear then leave it

if not divide by the smallest

work out the ratio

10

Q

Ionic equations?

A

break down all elements into their ions

cancel out ions either side of the equation

rewrite with what’s left

11

Q

Gas triangle?

A

volume on top, moles and 24 on bottom

12

Q

Volume of most gases at r.t.p

A

24