What is the cation exchange capacity (in meq/100 g) of a 200 g soil sample that contains the following amounts of exchangeable cations: 360 mg ca2+, 46 mg na+, 312 mg k+, and 216 mg mg2+?

use the following molar weights: ca2+ = 40.1 g/mol; na+ = 23.0 g/mol; k+ = 39.1 g/mol; mg2+ = 24.3 g/mol.