Answer:
2.13 x 10³moles
Explanation:
Given parameters:
Number of molecules in AlF₃ = 1.28 x 10²⁷molecules
Unknown:
Number of moles = ?
Solution:
A mole is a quantitative unit in chemistry used of taking measurements.
A mole of a substance is the amount of that substance that contains the avogadro's number of particles.
The particles can be molecules, atoms, neutrons, protons, electrons or formula units.
Number of moles = ![\frac{number of molecules }{Avogadro's number}](https://tex.z-dn.net/?f=%5Cfrac%7Bnumber%20of%20molecules%20%7D%7BAvogadro%27s%20number%7D)
Number of moles =
= 2.13 x 10³moles
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Answer:
P(total) = 3360 psi
Explanation:
According to the Dalton law of partial pressure:
The pressure of gas is sum of the partial pressure of each components.
P(total) = P₁ + P₂ + P₃ +.... + Pₙ
Given data:
Partial pressure of CO = 2235 psi
Partial pressure of CO₂ = 1125 psi
Total pressure = ?
Solution:
P(total) = P(CO) + P (CO)
P(total) = 2235 psi + 1125 psi
P(total) = 3360 psi
Explanation:
You have a solution that contains 36 g HCl dissolved in 64 g water
Molar mass HCl = 36.45 g/mol
Mol HCl in 36 g = 36 g / 36.45 g/mol = 0.9876 mol
Molar mass H2O = 18 g/mol
Mol H2O in 64 g = 64 g / 18 g/mol = 3.5556 mol
Total mol = 0.9875 + 3.5556 = 4.5431 mol
Mol fraction HCl = 0.9876 mol / 4.5431 mol = 0.2174
Mol fraction H2O = 3.5556 / 4.5431 = 0.7826
The answer should have 2 significant digits:
Mol fraction HCl = 0.22
Mol fraction H2O = 0.78
Mol fraction has no units.
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