Answer:
0.09589 g
Explanation:
The question tells us that tolouene is a hydrocarbon. Which means it made up of hydrogen and carbon only. So per gram of hydrocarbon, 0.9125 of it is carbon and the rest is hydrogen.
mass of carbon in 1g of tolouene = 1 g * 0.9125 = 0.9125 g
mass of hydrogen in 1 g of tolouene = 1 g - 0.9125 g = 0.0875 g
Then use their mass ratio to obtain the calculate the mass of hydrogen in a different sample of tolouene.
mass(hydrogen) : Mass (carbon)
0.0875 g : 0.9125 g
x g : 1 g
and if you cross multiply:
0.9125x = 0.0875
x = 0.09589 g
Yes a nucleus is located inside a cell.
Answer:
You have to add 285.642 mL of KH2PO4
Explanation:
<u>Step 1:</u> What is a buffer
A buffer is a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid. Buffers work by reacting with any added acid or base to control the pH.
pH of a buffer = pKa + log [conj base] / [weak acid]
<u>Step 2:</u> The ph of the buffer
6.97 = 7.21 =log [K2HPO4] / [KH2PO4]
-0.24 = log [K2HPO4] / [KH2PO4]
10 ^ -0.24 = [K2HPO4] / [KH2PO4] = 0.5754
0.5754 = (0.450 - x) / x
0.5754x = 0.450 - x
1.5754x = 0.450 L
x = 0.28564 = volume of KH2PO4
0.450 - 0.28564 = 0.16436 L K2HPO4
You have to add 285.642 mL of KH2PO4
C. Remember Pangea, the two continents were one right next to each other
Water: solute
alcohol: solvent
solution: a uniform mixture that has a solvent and at least one solute
solvent: the part of the solution with the largest amt
solute: the substance that is dissolved in a solution
