Answer:
The NH3 + with a PKa = 9.9
Explanation:
The Pka is a mathematical expression to express the dissociation grade of a substance in a solution, that means with a substance with a pKa small is a strong acid, and in this case since the solution pH is 8, that mean that the substance with high pKa ( lower acid strength) will predominate in a pH of 8.
The state of butter has changed. it only melted, and no new substance is formed or mixed with another substance
Answer:
443 L of carbon dioxide
Explanation:
Combustion reaction: CH₄ (g) + 2O₂ (g) → CO₂(g) + 2H₂O(g)
We assume, that the oxygen is the excess reagent, so let's convert the mass of methane to moles. (mass (g) / molar mass)
Firstly we need to convert the mass from kg to g → 0.300 kg .1000 g / 1kg
300 g / 16 g/mol = 18.75 moles of methane.
Ratio is 1:1, so 18.75 moles of methane will produce 18.75 moles of CO₂
We apply the Ideal Gases Law to find the answer:
Firstly we need to convert the T°C to T°K → 15°C + 273 = 288 K
P . V = n . R. T → V = ( n . R . T ) / P We replace data:
V = (18.75 mol . 0.0821 L.atm/mol.K . 288K) / 1 atm → 442.8 ≅ 443 L
Mass of HNO3 = ?
V = 0.5L
M.mass of HNO3 = 63.0067u
Molarity = 0.601
molarity = no of moles of solute/volume of solution in L
0.601 = no of moles of solute/0.5
no of moles of solute = 0.3005
mass of HNO3 = no of moles * M.mass
= 0.3005*63.0067
= 18.933g
