Answer:
To get the number of atoms in this sample, we first need the number of moles of lead in 11.3 grams
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<u>Number of moles of Lead:</u>
Molar mass of lead = 207 grams / mol
Number of moles = given mass / molar mass
Number of moles = 11.3 / 207
Number of moles = 0.05 moles
<u>Number of atoms of lead in 11.3 gram sample:</u>
Number of atoms = Number of moles * avogadro's number
Number of atoms = 0.05 * 6.022 * 10²³
Number of atoms = 5 * 10⁻² * 10²³ * 6.022
Number of atoms = 30.11 * 10²¹
Fractional distillation is a method for separating a liquid from a mixture of two or more liquids. For example, liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation. This method works because the liquids in the mixture have different boiling points.
Ummm I think it’s either the first one or the third one. Sorry if it’s wrong and good luck!
An example of a nuisance, oxygen reacts with iron to form rust.
This reaction involves the addition of oxygen, which is not needed.
2Fe(s) + 2H2O(l) + O2 (g)---> 2Fe^+2 (aq) + 4OH- (aq)
3.75 litres is the volume of the balloon indoors at a temperature of 25°C.
Explanation:
Data given:
initial temperature of the gas in balloon = -35°C or 238.15 K
initial volume = 3 litres
final temperature = 25 °C or 298.15 K
final volume =?
pressure remains constant
From the data given when pressure is constant Charles' law is applied.
=
Rearranging the equation to know the final volume of the gas in balloon
V2 =
V2 =
V2 = 3.75 Litres
when the temperature of a gas is increased and pressure remains constant the volume of the gas increases.