a 5.68 g sample of a solid containing ni is dissolved in 20.0 ml water. a 5.00 ml aliquot of this solution is diluted to 100.0 ml and analyzed in the lab. the analyzed solution was determined to contain 6.86 ppm ni . determine the molar concentration of ni in the 20.0 ml solution.

1. molar concentration in m

2. determine the mass, in grams, of ni in the original sample.

3. determine the weight percent of ni in the sample.