How much excess reactant remains when 50.0 g of MgBr2 reacts with 100.0 g AgNO3 based on the following chemical reaction?

M g B r subscript 2 space plus space 2 space A g N O subscript 3 space rightwards arrow space 2 space A g B r space plus space M g left parenthesis N O subscript 3 right parenthesis subscript 2

B.
92.3 g

A.
110.3 g

B.
92.3 g

C.
102 g

D.
7.7 g

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.