Answer:
the number of moles is 0.279
Explanation:
The calculation of the number of moles of calcium nitrate, is given below;
As We know that
Number of moles = mass of substance ÷ molecular weight
where
Mass of substance is 45.8g
And, the molecular weight is 164.088
so,
= 45.8 g ÷ 164.088
= 0.279moles
Thus , the number of moles is 0.279
We simply used the above formula so that the accurate value could arrive
Sulfur and sodium are those two elements
Answer:
a ground state electron jumps to a higher energy level
In titration, the moles of acid equal moles of base. You were given that 22.75ml of 0.215M NaOH is used, so calculate the number of moles of that base the experiment used in total. After that because you know mol base = mol acid, whatever amount of base you use must be the total amount of acid present in the solution. You were given the volume of the acid, and you have just found the total mols of acid. Using these two information, solve for the concentration. And one more thing, even though I'm pretty sure it won't affect your answer, you should always convert things to the proper units. Since the concentration we're talking about in this problem is molarity, which has the unit mol/L, you should always have all of your numbers in these units. It just make it simpler and will not confuse you
