A chemist wait out 87.1 g of sodium. Calculate the number of moles of sodium she weighed out. Round your answer to three significant digits

Atank contains 240 liters of fluid in which 10 grams of salt is dissolved. brine containing 1 gram of salt per liter is then pumped into the tank at a rate of 6 l/min; the well-mixed solution is pumped out at the same rate. find the number a(t) of grams of salt in the tank at time t.

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.

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.