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→Concentration as Molarity
| style="height:20px; width:300px; text-align:center;" |117g of [[NaCl]] is [[dissolve]]d in 0.5dm<sup>3</sup> of [[water]]. Calculate the [[concentration]] in g/dm<sup>3</sup>.
| style="height:20px; width:300px; text-align:center;" |28g of [[KOH]] is [[dissolve]]d in 100ml of [[water]]. Calculate the [[concentration]] in g/dm<sup>3</sup>.
| style="height:20px; width:300px; text-align:center;" |73g 7.3g of [[HCl]] is [[dissolve]]d in 400ml of [[water]]. Calculate the [[concentration]] in g/dm<sup>3</sup>.
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| style="height:20px; width:200px; text-align:left;" |
| style="height:20px; width:200px; text-align:left;" |
'''Find the number of [[mole]]s.'''
[[mass]] = 73g7.3g
[[Relative Formula Mass]] = 36.5g
Number of [[Mole]]s = <math>{\frac{m}{M_r}}</math>
Number of [[Mole]]s = <math>{\frac{737.3}{36.5}}</math>
Number of [[Mole]]s = 0.2mol
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'' '''concentration (mol/dm<sup>3</sup>)''' '' = <math>\frac{mass (g)}{volume (dm^3)}</math>
'' '''concentration''' '' = <math>\frac{0.2}{0.4}</math>
'' '''concentration''' '' = 0.5mol/dm<sup>3</sup> = 5M
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