Answer:
Explanation:
pKa = 3.86
-log Ka = pKa
- log Ka = 3.86
Ka = 1 / ( 10^(3.86)) = 1.38 × 10⁻⁴
lactic → (H⁺) + lactate
but Ka ( equilibrium constant ) = ( H⁺) (lactate) / ( lactic acid)
when HCl dissociate, it forms
HCl → H ⁺ + Cl⁻
0.08 M of HCl will yield 0.08 M H⁺, lactate ion = 0.1 M
1.38 × 10⁻⁴ = (0.08) (lactate) / 0.1
(1.38 × 10⁻⁴ × 0.1) / 0.08 = lactate
lactate = 1.73 × 10⁻⁴
A. Its temperature will rise continuously until it completely melts
I don't believe that any of the other answers are correct because the ice cannot stay at a certain temperature if it is melting.
The mass would still be the same 25.0 g but the volume would be bigger
Answer:
4.4 g
Explanation:
Step 1: Write the balanced equation
Cu + 4 HNO₃ ⇒ Cu(NO₃)₂ + 2 NO₂ + 2 H₂O
Step 2: Calculate the moles corresponding to 3.2 L of NO₂ at STP
At standard temperature and pressure, 1 mole of NO₂ occupies 22.4 L.
3.2 L × 1 mol/22.4 L = 0.14 mol
Step 3: Calculate the moles of Cu needed to produce 0.14 moles of NO₂
The molar ratio of Cu to NO₂ is 1:2. The moles of Cu needed are 1/2 × 0.14 mol = 0.070 mol.
Step 4: Calculate the mass corresponding to 0.070 moles of Cu
The molar mass of Cu is 63.55 g/mol.
0.070 mol × 63.55 g/mol = 4.4 g
Answer:
Ar < Cl - < S2-
Explanation:
All the species written above are isoelectronic. This means that they all possess the same number of electrons. All the species above possess 18 electrons, the noble gas electron configuration.
However, for isoelectronic species, the greater the atomic number of the specie, the smaller it is. This is because, greater atomic number implies that their are more protons in the nucleus exerting a greater attractive force on the electrons thereby making the specie smaller in size due to high electrostatic attraction.