Rounding off the number 399 870 to three significant figures is, 4.00 x 104
3,01 x 10
3,99 x 104
4,00 x 10

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

Which statement best describes the flow of energy in this scenario

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?