How many grams of CO are in 125 mL of .25M solution
0.87g
1.1g
14g
880g

The number of  grams of Co that  are  in 125 Ml  of  0.25 M solution  is  0.87 grams                             

          calculation

find the number of moles

 moles= molarity  x  volume in liters

volume in liters =  125/1000 = 0.125 L

molarity =  0.25 M

moles  is therefore =  0.125 x 0.25=0.0313 moles

 mass  = moles   x molar mass

molar mass of Co= 12 +16  =28g/mol

mass   is therefore =  28 g/mol  x0.0313 moles= 0.87 grams

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Explanation:

the answer is b. dilution

the answer is 75.0%.