Answer: Is CO2 gas a pure substance?
Explanation: Is carbon dioxide gas considered a pure substance? ... Carbon dioxide and water are molecules made of two different kinds (elements) of atoms. Oxygen gas is also molecular but it's made up of only one kind (element) of atoms.
Answer:
0.500 moles
Explanation:
In order to convert grams of any given substance into moles, we need the <em>substance's molar mass</em>:
- Molar Mass of CH₃Br = Molar Mass of C + (Molar Mass of H)*3 + Molar Mass of Br
We can find the molar masses of each element in the periodic table:
- Molar Mass of CH₃Br = 94.94 g/mol
Now we can <em>divide the given mass by the molar mass</em> in order to <u>calculate the number of moles</u>:
- 47.5 g ÷ 94.94 g/mol = 0.500 moles
The relation between base equilibrium constant and degree of dissociation is
C x^2 = Kb
x is degree of dissociation
C x^2 = 3.3 * 10^-6
(0.17) x^2 = 3.3 * 10^-6
x = 4.24 * 10^-3
Concentration of hydroxyl ion is
[OH-] = c x = 0.17 * 4.24 * 10^-3 = 0.72 * 10^-3 M
PoH = - log [OH-] = 2.85
PH = 14 - pOH = 11.15
Hence, pH of solution is 11.15