Answer:
In the gas there are 6.02x10²² molecules
Explanation:
This is a problem to be solved by the Ideal Gas Law formula, which is this one:
Pressure . volume = n° moles . R . T° in K
The excersise presented R as 8.31 J/mol, but If i follow the others data, I'd rather use 0.082 L.atm / mol.K
Let's replace numbers:
2.5 atm . 1L = n° moles. 0.082L.atm / mol.K . 303K
(2.5 atm . 1L) / (0.082 mol.K/L.atm . 303K) = n° moles
0.100 moles = n
Now that we have the moles, we can use NA to calculate the total of molecules:
1 mol ___ has __ NA molecules
0.1 mol has ____ ( 0.1 . 6.02x10²³) = 6.02x10²² molecules
Answer:
The concentration of the pyridinium cation at equilibrium is 1.00×10⁻³ M
Explanation:
In water we have
C₅H₅NHBr + H₂O ⇒ C₅H₅NH+ + Br−
Pyridinium Bromide (C₅H₅NHBr) Dissociates Completely Into C₅H₅NH+ And Br− as such it is a strong Electrolyte.
Therefore the number of moles of positive ion produced per mole of C₅H₅NHBr is one
pH = - log [H₃O⁺] Therefore 10^-pH = [H₃O⁺] = concentration of C₅H₅NHBr
= 10⁻³ = 0.001M = concentration of C₅H₅NHBr
The concentration of C₅H₅NHBr is = 1.00×10⁻³ M to two places of decimal
I wanna say it's B... I hope I could help you; apologies if I'm incorrect.
Answer:
the kidney control the amount of water, ion, and other substances in the blood by excreting more or less of them in urine, also secretes the hormones that help maintain homeostasis
Percent by mass of platinum in white gold = 100% - 45% = 55%
We let x be the mass of the white which is 45% gold and 55% platinum.
Mass of gold in white gold = m x 0.45
where m is the total mass.
From the given above, we formulate the equation that would allow us to determine the mass of white gold.
154 = x (0.45)
x = 342.22 g
Then, we determine the amount of platinum.
mass of platinum = (342.22 g)(0.55)
mass of platinum = 188.22 grams
Thus, 188.22 grams of platinum is needed.