Hi!
• For this you want to convert moles to grams
• To do this you would simply multiple your moles times the atomic mass of potassium
3.25 x 39.098= 127.0685
• So your answer for this should be about 127.07 depending on how you need to round!
The chemical formula of hydrocortisone valerate is C26H38O6. First, we determine the molar mass of the substance by adding up all the products of the number of atoms and the molar mass of atoms as shown below.
molar mass = 26(12) + 38(1) + 6(16) = 446 g/mol
Since, there are 26 atoms of carbon in each molecule, the mass of carbon in each mole is
mass of carbon = (26)(12) = 312
Obtaining the percent by mass of carbon,
% by mass of carbon = (312/446) x 100 %
= 69.955%
Thus, the percent by mass of carbon in hydrocortisone valerate is approximately 69.96%.
DETERMINE THE CHARGE OF ELECTRON CLOUD OF POTASSIUM?
Answer:
the charge is 22
Answer:
The ice will not melt
Explanation:
Given:
Mass of chunk = 0.25 g
moles of sodium = mass / molar mass = 0.25 / 23 = 0.010 g
ΔH = -368 KJ
Hence, 2 moles of Na produced 368 KJ
So 1 mole will produce 368 / 2 KJ and 0.01 mole will produce
= (368 / 2) * 0.01 = 2.0056 KJ
Also, moles of ice = mass / molar mass of water = 50 / 18 = 2.8 g
Energy required to melt the ice = enthalpy of fusion of ice * number of moles of ice
= 6.01 * 2.8 = 16.722 KJ
But we have 2.0056 KJ, so the ice will not melt.