# chemistry equations

how do you calculate mass of substance?
mass of substance = no. moles X Mr
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what is the ideal gas equation?
pV = nRT
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what is the concentration equation?
no. moles = concentration X volume (dm^3)
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how do you find the number of moles of a gas?
no. moles = volume (dm^3) / 24
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how do you calculate the percentage yeild?
% yeild = actual yeild / theoretical yeild X 100
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what is the equation for atom economy?
atom economy = mass of desired product / mass of total reactants
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how do you caculate enthalphy change of a reaction?
entahlphy change = energy of reactants - energy of products
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what is the enthalphy change equation?
q = mass of water X specific heat capacity X change in temperature
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## Other cards in this set

### Card 2

#### Front

what is the ideal gas equation?

pV = nRT

### Card 3

#### Front

what is the concentration equation?

### Card 4

#### Front

how do you find the number of moles of a gas?

### Card 5

#### Front

how do you calculate the percentage yeild?