[طالبة اشعه]

؛

السلام عليكم
لو سمحتوا ممكن تشرحوا لي كيف انحلّت هالمسائل مو فاهمه شيء والاربعاء الفاينل :(

how many grams of na2co3 to propare 100ml 0.2 ?
هذا الحل بكتبه عشان تشرحوا لي ايش الخطوات

grams of na2co3 = number of moles * molar mass

molarity = mole of solute / volume solution

mole of solute = molarity * volume solution

molar mass = 2*23 + 12 + 3*10 = 106 m/mole

mole of solute = 0.2 * 0.1 = 0.02

molar mass = 2(23+121.01+3*16

= 106.01gm/m

gram of na2co3= 0.02*106.01
= 2.12 gm


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المسئله الثانيه

if the concentration of glucose in the blood = 120 mg/100ml
what is the concentration in mole/L ?
120mg/100ml >>> 0.120gm/100m

= 6.6*10^-4*180/100

= 6.66 mole/litre
= 6.66 mole/L