Solution :
26. Ans (B) 1.00 moles of CaBr2
4M CaBr2 means that one litre contains 4 moles.
Therefore 250 ml of 4M CaBr2 contains 4 x 250/1000 = 1 mole.
When it is diluted to 1.6 L, this 1 mole will be present in 1.6 Litres.
27. Ans (E) 0.257 M
850 ml of 1.36 M NH4Cl contains 1.36 x 850 /1000 = 1.156 moles
When it is diluted to 4.5 L, this 1.156 moles will be present in 4.5 L
Therefore number of moles per L = 1.156/4.5 = 0.257 , that is the resulting solution has the concentration of 0.257M
28. Ans (E) 8.3 ml of stock solution mixed with enough water to make 25 ml.
25 ml of 0.25 M MgCl2 contains 25 x 0.25/1000 = 0.00625 moles.
So to prepare 25 ml of 0.25 M MgCl2, we need 0.00625 moles
This 0.00625 moles need to be obtained from the stock solution of 0.75 M MgCl2
Suppose A ml of the stock solution contains 0.00625 moles , then A x 0.75/1000 = 0.00625
Therefore A = 0.00625 x 1000 / 0.75 = 8.3 ml.
29. Ans (B) 0.200 L Ba(OH)2
As per equation 2 moles of HNO3 can react with 1 mole of Ba(OH)2
Therefore 0.300 M of HNO3 can react with 0.150 M of Ba(OH)2
So, 200 ml of 0.300 M HNO3 can react with 200 ml of 0.150M Ba(OH)2
26) If 250 mL of 4,00 M CaBr, is diluted to 1.60 L. the resulting solution...
help with 27-29 please UI LABI 2 4oom 2.2504 405 m2 27) If 850 mL of 1.36 M NH.Cl is diluted to 4.50 L, the concentration of the resulting solution is A) 0.0356 M B) 0.200 M C) 4.00 M D) 40.0 M E) 0.257 M 28) To prepare 25 mL of 0.25 M MgCl, solution from a 0.75 M MgCl, stock solution, you shoul A) 10 mL of stock solution mixed with enough water to make 25 ml B)...
13.9 Molarity and chemical reactions in aqueous solution Volume of solution A Volume of solution B Molarity Molarity Particles Particles of A Avogadro's number Moles of A Equation coefficients Formula subscripts Moles of B Avogadro's number of B Molar mass Molar mass Grams of A Grams of B 2011 Pearson Education, Inc Percent by mass (g solute/g solution) Take 100 g solution Mass of solution Mass of solute Density Molar mass Volume of solution Moles of solute Division Molarity (moles...
Please show the working out for #25, 28 and 29 25) Calculate the volume (in L) of a solution that contains 3.12 moles of NaCl if the concentration of this solution is 6.67 M NaCl. A) 2.14 L B) 20.8 L C) 46.8 L D) 0.468 L 28) To prepare 25 mL of 0.25 M MgCl2 solution from a 0.75 M MgCl2 stock solution, you shouls A) 10 mL of stock solution mixed with enough water to make 25 ml...
E l is to OH mole of ll in hare solution water the prepared by dissolving 0.150 get enough water to 4.00L and H2O molar concentration? of Ba(OH₂) solution. What
When 10.00 mL of 3.98 M stock solution is diluted to 250.0 mL, the resulting solution is Fill in the blank, molar
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