Using dimensional analysis, we can find the moles of strontium by comparing the mass of strontium to it's atomic mass. You can find the atomic mass of Sr on the periodic table: Atomic Mass Sr = 87.62g/mol
In case you are not familiar, dimensional analysis works like this: (what we know) x (conversion factor) = what we are looking for
The conversion factor compares the units of what we know to the units of what we are looking for. In this case, the conversion factor is: 1 mol/87.62g
The important thing to note about the conversion factor is that you want to be able to cancel out the units of your given measurement (in this case, it is the mass)
So, our full solution will be: moles Sr = (175.24 g)x(1 mol/87.62 g) (cancel out the mass units) moles Sr = 175.24 x 1 mol/87.62 = 2.00 mol Sr
The environment would have most likely been covered in deep water such as in a lake or swamp. One with clay particle and other fine particle sediments.
When the guard cell is filled with water and it becomes turgid, the outer wall balloons outward, drawing the inner wall with it and causing the stomate to enlarge.
