How many electrons are present if a bromine ion has a charge of -1

Given sno2 + 2h2 - sn + 2h20 tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?

If oil spills continue, all of the following should be expected except (2 points) death of aquatic life. polluted groundwater. decreased soil productivity. increased global temperatures.

What is the predicted change in the boiling point of water when 1.50 g of barium chloride is dissolved in 1.50 kg of water?