Molecular Formula Flashcards

1
Q

What does M stand for and what is it?

A

It is the molar mass (gmol-1) it can be found out using Ar(x)+Ar(b)
(Ar is found on the periodic table)

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2
Q

What does n stand for and how can it be found?

A

Number of moles(mol)
It can be found using n=m(mass g)/M(gmol-1)
n=N/NA

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3
Q

What does N stand for and how is it found

A

Number of particles
If we know the mole(n)
N=nxNA

If we know the mass(m)
1.n=m/M
2.N=nxNA

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4
Q

What does m stand for and how can it be found

A

It is mass(g)
If we know the number of particles (N)
1.n=N/NA
2.m=nxNA
If we know the mole(n)

m=nxNA

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5
Q

what is NA

A

Advogadros constant (mol-1)
6.02x10^23

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6
Q

Empirical formula

A

Composition/ mass
Then divide by the smallest answer

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7
Q

Alkane general formula:

A

CnH2n+2

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8
Q

Alkene general formula:

A

CnH2n

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9
Q

Alkyne general formula:

A

CnH2n-2

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10
Q

when asked for the amount of substance

A

mol
n=N/Na

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11
Q

when asked for the number of molecules

A

N=nxNa

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12
Q

when asked for the number of atoms

A

N=(how much elements there are ex. H2O=3)xnxNa

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13
Q

Ar formula

A

(no. of pt)x(abundance)/100

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14
Q

molecular formula

A

(gmol-1 that’s given in the question )/molar mass
then use the answer to times the empirical formula with

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15
Q

percentage composition

A

(how much of the element) x the no. found on pt x 100

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