0.1447 g of a diprotic acid is dissolved in 20 ml water. The diprotic acid solution requires 11.74 ml of a 0.0909 m naoh titrant solution to reach the endpoint. Calculate the molar mass of the acid. Watch significant figures.
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Ответ:
Explanation:
Percentage ethylene by weight = 57%
Percentage propylene by weight = 43%
Suppose in 100 grams of polymer:
Mass of ethylene = 57 g
Mass of propylene = 43 g
Moles of ethylene =![\frac{57 g}{28 g/mol}=2.036 mol](/tpl/images/0547/6529/b7181.png)
Moles of propylene =![\frac{43g}{42g/mol}=1.024 mol](/tpl/images/0547/6529/d9868.png)
1 mole =
molecules/ atoms
Units of ethylene =![2.036 mol\times N_A](/tpl/images/0547/6529/c1ae4.png)
Units of propylene =![1.024 mol\times N_A](/tpl/images/0547/6529/407c3.png)
a) Fraction of ethylene units:
b ) Fraction of propylene units: