Marine Biologist, astronomer and geologist
Hope this helps.
We are going to use this equation:
ΔT = - i m Kf
when m is the molality of a solution
i = 2
and ΔT is the change in melting point = T2- 0 °C
and Kf is cryoscopic constant = 1.86C/m
now we need to calculate the molality so we have to get the moles of NaCl first:
moles of NaCl = mass / molar mass
= 3.5 g / 58.44
= 0.0599 moles
when the density of water = 1 g / mL and the volume =230 L
∴ the mass of water = 1 g * 230 mL = 230 g = 0.23Kg
now we can get the molality = moles NaCl / Kg water
=0.0599moles/0.23Kg
= 0.26 m
∴T2-0 = - 2 * 0.26 *1.86
∴T2 = -0.967 °C
D.)good conductor of electricity
Explanation:
One very important property of gold is that is a good conductor of heat and electricity.
All known metals are able to act as good conductors of electricity and heat due to the presence of a large pool of free mobile electrons in them.
Gold is a metal and it is not an exception. Like other metals, gold is not rigid but ductile.
It contains metallic bonds between its particles and is able to move electric currents.
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Ionic bond brainly.com/question/6071838
Answer:
Explanation:
Hello!
In this case, since the reaction between aluminum and iron (III) oxide is:
In such way, since there is 2:1 mole ratio between aluminum (atomic mass = 26.98 g/mol) and iron (III) oxide (molar mass = 159.70 g/mol), we'll be able to compute the mass of the required reactant as shown below:
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Answer:
132 54Xe
Explanation:
From the question given above, the following were obtained:
Proton = 54
Neutron = 78
Atomic number =?
Atomic symbol =.?
Next, we shall determine the atomic number of the isotope. This can be obtained as follow:
Atomic number of an element is simply defined as the number of protons in the atom of the element.
Thus,
Atomic number = proton number
Proton = 54
Atomic number = proton number = 54
Atomic number = 54
Therefore, the atomic number of the isotope is 54
Next, we shall determine the mass number of the isotope. This can be obtained as follow:
Proton = 54
Neutron = 78
Mass number =.?
Mass number = Proton + Neutron
Mass number = 54 + 78
Mass number = 132
Therefore, the mass number of the isotope is 132.
From the calculations made above, the isotope have:
Atomic number = 54
Mass number = 132
Comparing the atomic number with those in the periodic table, the isotope is Xenon (Xe).
Thus, the atomic symbol for the isotope is 132 54Xe.