Calculate the mass of water produced when 8.41 g of butane reacts with excess oxygen

Why dose heating increase the speed at which a solution dissolved in water

The molar mass of cu is 63.55 g/mol. the number of grams of cu produced in this reaction is

What sources of error may have contributed to the percent yield not being 100 percent? think about things that may have led to inaccurate measurements or where mass of the product could have been lost if this experiment was conducted in a physical laboratory.