Answer:
40.8g of sodium sulfate must be added
Explanation:
The reaction of barium nitrate, Ba(NO₃)₂ with sodium sulfate, Na₂SO₄ is:
Ba(NO₃)₂ + Na₂SO₄ → 2 NaNO₃ + BaSO₄(s)
That means, for a complete reaction of an amount of barium nitrate you must add the same amount in moles of sodium sulfate. To solve this problem we need to convert the mass of barium nitrate to moles = Moles of sodium sulfate that must be added:
<em>Moles Ba(NO₃)₂ -Molar mass: 261.3g/mol-:</em>
75g * (1mol / 261.3g) = 0.287 moles = Moles Na₂SO₄
<em>Mass Na₂SO₄ -Molar mass: 142.04g/mol-:</em>
0.287 moles * (142.04g / mol) =
<h3>40.8g of sodium sulfate must be added</h3>
The standard cell potential is obtained from the equation of the reaction.
<h3>What is the standard cell potential?</h3>
The standard cell potential is obtained from the equation of the reaction. Now we have the overall cell equation as from the half reactions as;
Oxidation half reaction;
Al(s) --->Al³+ (aq) + 3 e
Reduction half equation;
Cu²+ (aq) + 2 e →→ Cu(s)
Standard cell potential Eºcell = 0.34V - (-1.66 V) = 2 V
Now;
ΔG = -nFEcell
ΔG = -(2 * 6 * 96500 * 2)
ΔG = -2316kJ
E = 2 - 0.0592/6 log [0.0025]/[3.5 M]
E = 2 + 0.031
E = 2.031 V
Learn more about standard cell potential:brainly.com/question/14240930
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Answer:
Most of the mass of an atom comes from the electron cloud.
Explanation:
All options are correct except,
Most of the mass of an atom comes from the electron cloud. Because,
Most of mass comes from nucleus in which protons and neutrons are present.
The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.
Symbol= e-
Mass= 9.10938356×10-31 Kg
It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties
While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.
Symbol of proton= P+
Symbol of neutron= n0
Mass of proton=1.672623×10-27 Kg
Mass of neutron=1.674929×10-27 Kg
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.