Question

The Mackenzie River in northern Canada contains, on average,

0.820 mM Ca2+
0.430 mM Mg2+
0.300 mM Na+
0.0200 mM K+
0.250 mM Cl–
0.380 mM SO42–
and
1.82 mM HCO3–.

What, on average, is the total mass of these ions in 4.75 L of Mackenzie River water?