Answer:
The options are
A.Surroundings get colder and the system decreases in volume.
B.Surroundings get hotter and the system expands in volume.
C.Surroundings get hotter and the system decreases in volume.
D.Surroundings get hotter and the system does not change in volume.
From the Most energy released to the most absorbed , the order is
B. Surroundings get hotter and the system expands in volume.
D. Surroundings get hotter and the system does not change in volume.
C. Surroundings get hotter and the system decreases in volume.
A. Surroundings get colder and the system decreases in volume.
Answer:
A.)
Explanation:
Just took this test and got the question right!
Answer:
Look up at the atom on the periodic table of elements and find out what its atomic mass is. Subtract the number of protons from the atomic mass. This is the number of neutrons that the regular version of the atom has. If the number of neutrons in the given atom is different, than it is an isotope.
<span>Among the given choices, which among them tells us the truth about the polyatomic ion. The polyatomic ions are charged molecules or formula units that are composed of many atoms. From the given choices, the answer would be letter C. It is made of atoms that are covalently bonded together. When we say covalently bonded, the atoms are shared among the atoms composing the formula unit. </span>
Answer:
i = 2.483
Explanation:
The vapour pressure lowering formula is:
Pₐ = Xₐ×P⁰ₐ <em>(1)</em>
For electrolytes:
Pₐ = nH₂O / (nH₂O + inMgCl₂)×P⁰ₐ
Where:
Pₐ is vapor pressure of solution (<em>0.3624atm</em>), nH₂O are moles of water, nMgCl₂ are moles of MgCl₂, i is Van't Hoff Factor, Xₐ is mole fraction of solvent and P⁰ₐ is pressure of pure solvent (<em>0.3804atm</em>)
4.5701g of MgCl₂ are:
4.5701g ₓ (1mol / 95.211g) = 0.048000 moles
43.238g of water are:
43.238g ₓ (1mol / 18.015g) = 2.400 moles
Replacing in (1):
0.3624atm = 2,4mol / (2.4mol + i*0.048mol)×0.3804atm
0.3624atm / 0.3804atm = 2,4mol / (2.4mol + i*0.048mol)
2.4mol + i*0.048mol = 2.4mol / 0.9527
2.4mol + i*0.048mol = 2.5192mol
i*0.048mol = 2.5192mol - 2.4mol
i = 0.1192mol / 0.048mol
<em>i = 2.483</em>
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I hope it helps!
