mole map
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The document discusses molarity and calculations involving moles, molar mass, and number of particles. It provides examples of calculating the molecular masses of SO2 and caffeine based on given atomic masses. It also gives an example of calculating the number of moles in 5.68 g of iron using the formula n=mass/molar mass, finding the number of moles to be 0.1 mol.
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mole map
- 1. Map of molarity Mole mass solids/liquids formula for mole calculation n= mass/ molar.mass n=m/mol.m m=n*mol.mass particles n=no pf particlas/avagadros numb no of particles=n*avagadros numb gases n=vol(dm3)/22.4 dm3.mol-1 n=vol(dm3) at stp/molar vol
- 2. Practice problem 1.1 Calculate the molecular masses (in amu) of the following compounds: SO2 Caffeine (C8H10N4O2) Atomic mass of C=12, s=32, N=14, H=1, O=16 Solution: SO2 32+2(16) =64 amu Caffeine (C8H10N4O2) 8(12) +10(1) +4(14) +2(16) = 194 amu.
- 3. Practice problem 1.1 Calculate the number of moles in 5.68 g of iron. Atomic mass of iron Fe=55.8 Solution: No of moles=n=? Mass of Fe=5.68 g As we know that n= mass/ molar. Mass so by putting values in the formula n=5.68 g /55.8 g.mol -1 , n= 0.1 mol.