رد: هنا استفسارات كيمياء 110 للتحضيري
اذا سمحتي دكتوور ساعديني في حل هاذي الاسئلة :
What mass of K2CO3 is needed to prepare 200. mL of a solution having a potassium ion concentration of 0.150 M?
A 50.0 mL sample of 0.436 M NH4NO3 is diluted with water to a total volume of 250.0 mL. What is the ammonium nitrate concentration in the resulting solution?
4. What volume, in mL, of a 3.89 x 10-2 M solution is required to provide 2.12 g of KBr?
(Atomic weights: K = 39.10, Br = 79.90).
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