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How many moles of aluminium cations are present in $"5.1 g"$ of aluminium oxide?
The idea here is that each formula unit of aluminium oxide, $"Al"_color(red)(2)"O"_color(blue)(3)$, consists of two aluminium cations, $color(red)(2) xx "Al"^(3+)$ three oxygen anions, $color(blue)(3) xx "O"^(2-)$...
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The molar mass of fluorine is 19.00 g/mol and that of aluminium is 26.98 g/mol. How do you calculate the molar mass of aluminium fluoride?
The formula of aluminium fluoride is $"AlF"_3$. This tells us that one formula unit of $"AlF"_3$ contains one atom of $"Al"$ and three atoms of $"F"$. It also...
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How many aluminium atoms are present in 5.396 grams of aluminium?
2Al + 6HCI -> 2AlCl3 + 3H2
We need (i) to calculate the molar quantity: $(5.396*g)/(26.982*g*mol^-1)=0.2000*mol$ And then (ii), multiply this molar quantity by $"Avogadro's number"$, $6.022xx10^23*mol^-1$ to get................................... $0.2*molxx6.022xx10^23=??$
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Which of these two ionic compounds has the higher melting point: sodium oxide or aluminium oxide? Why?
For sodium chloride, each of the constituent ions have unit charge. For alumina, the ionic lattice is composed of $Al^(3+)$ and $O^(2-)$ ions. Because the electrostatic force of attraction should...
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What is the mass of a $405*mL$ block of aluminium given that $rho_"Al"=2.70*g*mL^-1$?
Now $rho="Mass"/"Volume"$, and thus.... $"Mass"=rho_"Al"xx"volume"$ $=2.70*g*cancel(mL^-1)xx405*cancel(mL)=??*g$
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Consider these elements: Gold, Sodium, Magnesium, Platinum, Aluminium. What is total number of metals found in nature in free native state?
Both platinum and gold are so-called Noble metals, and can still be found as nuggets in the Earth's crust. The occurrence of gold in alluvial deposits was responsible for several...
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What is the ground-state term symbol for the aluminium atom in a magnetic field?
I got $""^2 P_"1/2"$ (read as "doublet-P-one-half"). Well, the ground-state is: $[Ne] 3s^2 3p^1$ which looks like this: $ul(uarr color(white)(darr)) " " ul(color(white)(uarr...
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When light f=1.2x10^15 hz illuminates an aluminium surface , a stopping potential of 1.5V is needed to reduce photoelectric current to 0. Determine the minimum possible energy of light that can eject electrons from the metal?
Recall the definition of Stopping potential the given quantity. The negative potential applied on the collector of a photoelectric cell at which the photoelectric current becomes zero is called the...
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Cans for food and drinks are made from steel or aluminium The main metal in steel is iron. Iron is extracted by heating a mixture of iron oxide and carbon in a blast furnace. What type of reaction is this?
The production of iron from ore in a blast furnace clearly falls under the umbrella of : $Fe_2O_3(s) + 3CO(g) rarr 2Fe(l) + 3CO_2(g)$ The coke (the carbon) is first...
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Why is the aqueous solution of aluminium chloride acidic?
An aqueous solution of $"AlCl"_3$ is a product of the the reaction between hydrochloric acid ($"HCl"$) and aluminum hydroxide ( $"Al(OH)"_3$). $"HCl"$ is a strong acid, and $"Al(OH)"_3$ is a...
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