(U2) Formulae And Amounts Of A Substance Flashcards

1
Q

What is empirical formula?

A

A formula which shows the simplest whole number ratio of atoms of each element in a compound

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2
Q

What is molecular formula?

A

A formula which shows the actual number of atoms of each element in a molecule

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3
Q

What is meant by molar gas volume?

Give an example.

A
  • The volume of one mole of gas under specified conditions of temperature and pressure
  • e.g. 24 dm3 at 20°C (293K) and 1 atm pressure
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4
Q

State the equation for Avogadro’s Law on gases at 20ºC and 1 atm pressure

A

Volume = number of moles x 24

V = N x 24

dm3 = mol x 24

V
N | 24

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5
Q

What is the equation for percentage yield?

A

Actual yield / theoretical yield x 100

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6
Q

What is the equation for atom economy?

A

Mass of desired product / total mass of products x 100

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7
Q

What is the formula for used to determine a hydrocarbon?

A

CxHy + (X + y/4)O2 —> XCO2 + (y/2)H2O

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8
Q

What is the word equation for determining the volume of oxygen in hydrocarbon combustion reactions?

A

Volume of oxygen = (initial contraction - volume of CxHy) + volume of CO2

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