ابغى طريقه حل دي الاسئله (( كيمياء ))
السلام عليكم ورحمه الله وبركاااته
لو سمحتووو ابغى طريقه حل دي الاسئله
1. What mass of K2CO3 is needed to prepare 200. mL of a solution having a potassium ion concentration of 0.150 M?
A. 4.15 g
B. 10.4 g
C. 13.8 g
D. 2.07 g
E. 1.49 g
2. 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?
A. 21.8 M
B. 0.459 M
C. 2.18 ´ 10-2 M
D. 8.72 ´ 10-2 M
E. 0.109 M
3. How many milliliters would you need to prepare 60.0 mL of 0.200 M HNO3 from a stock solution of 4.00 M HNO3?
A. 60 mL
B. 240 mL
C. 24 mL
D. 1000 mL
E. 48 mL
|