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ftshaechan
20.07.2019 •
Chemistry
What mass of kbr is present in 25 ml of a 0.85 m solution of potassium chloride?
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Ответ:
Answer : The correct answer for mass of KBr = 2.53 g
Given :
Molarity of KBr solution = 0.85 M
Volume of KBr solution = 25 mL
Converting volume from mL to L ( 1 L = 1000 mL )
Volume of solution = 0.025 L
Mass of KBr = ?
Mass of KBr can be calculated using following steps :
1) To find mole of Kbr :
Mole of KBr can be calculated using molarity .
Molarity : It is defined as mole of solute present in volume of solution in Liter .
It uses unit as M or![\frac{mol}{L}](/tpl/images/0112/4956/ab769.png)
It can be expressed as :
Plugging value of molarity and volume
Multiplying both side by 0.025 L
Mole of KBr = 0.02125
2) To find mass of Kbr :
Mass of Kbr can be calculated using mole . Mole can be expressed as :
Mole of Kbr = 0.02125 mol
Molar mass of KBr = 119.00![\frac{g}{mol}](/tpl/images/0112/4956/02eab.png)
Plugging values in mole formula
Multiplying both side by 119.00![\frac{g}{mol}](/tpl/images/0112/4956/02eab.png)
Mass of KBr = 2.53 g
Ответ: