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How do we explain the fact that cobalt comes before nickel in the periodic table, even though cobalt has a higher atomic mass than nickel?
on are ordered according to the number of protons an atom of the element has in its nucleus. This is called the . Cobalt has 27 protons while Nickel...
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Pure copper may be produced by the reaction of copper(I) sulfide with oxygen gas as follows: $Cu_2S(s) + O_2(g) -> 2Cu(s) + SO_2(g)$. What mass of copper(I) sulfide is required in order to prepare 0.650 kg of copper metal?
You have given the stoichiometric equation that represents reduction of cuprous sulfide: $Cu_2S(s) + O_2(g) rarr 2Cu(s) + SO_2(g)$ Sulfur is oxidized; copper and oxygen are reduced. $"Moles of copper"=(650*g)/(63.55*g*mol^-1)=10.3*mol$....
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What is the volume of 0.100 M sodium hydroxide needed to precipitate all of the nickel(II) ions from 150.0 mL of 0.250 M nickel(II) nitrate?
$Ni^(2+) + 2OH^(-) rarr Ni(OH)_2(s)darr$ Alternatively, $Ni(NO_3)_2(aq) + 2NaOH(aq) rarr Ni(OH)_2(s) + 2NaNO_3(aq)$ We need a stoichiometrically balanced equation to inform our calculations. $"Moles of nickel ion"$ $=$ $150.0xx10^-3Lxx0.250*mol*L^-1=0.0375*mol$....
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A student investigated the reactions of copper carbonate and copper oxide with dilute hydrochloric acid. How can a sample of copper chloride crystals be made from copper carbonate and dilute hydrochloric acid?
$CuCO_3(s) + 2HCl(aq)rarrCuCl_2(aq) + CO_2(g)uarr + H_2O(l)$ Or........... $CuO(s) + 2HCl(aq)rarrCuCl_2(aq) + H_2O(l)$ For each acid base reaction the product is the beautiful blue-coloured $[Cu(OH_2)_6]^(2+)$ ion, which is commonly represented...
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A quarter is composed of 4.50 moles of nickel. How many atoms of nickel does this equal?
Clearly, $4.50$ $"moles"$ of $Ni$ has a mass of $4.50$ $mol$ $xx58.69*g*mol^-1$, which is approx. $270$ $g$. If you are talking about American currency, I am pretty sure that nickels...
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A chemist weighed out 3.89 g of nickel. What is the number of moles of nickel she weighed out?
For this question, we need to use to find the molar mass of $"Ni"$ (58.69 g/mol). The formula for molar mass is $color(blue)(|bar(ul(color(white)(a/a) "molar mass" = "mass"/"moles"color(white)(a/a)|)))"...
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How many moles of nickel are in $5.12 * 10^25$ atoms of nickel?
The key here is Avogadro's constant, which tells you the number of representative particles present in $1$ mole of a substance. By definition, and this is what Avogadro's constant...
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Hydrogen was passed over heated 2g copper oxide till only copper was left. The mass of copper obtained was was 1.6 grams. What is the percentage of oxygen in copper oxide?
There is a loss of 0.4 grams. $ 2.0 -1.6$ = 0.4 grams $ 0.4/2.0 xx 100 $ = 20% The Hydrogen will combine with the Oxygen in...
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Copper will react with sulfur to form a copper sulfide, if 1.500g copper reacts with sulfur to form 1.880g of copper sulfide, what is the empirical formula of the copper sulfide?
The idea here is that you need to use the mass of copper and the mass of the copper sulfide to determine how much sulfur the produced compound contains, then...
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An oxide of copper contains 2.118 g of copper and 0.2666 g of oxygen. Another oxide of copper contains the same mass of copper but 0.5332 g of copper. What are the empirical formulas of the oxides?
The empirical formulas are $"Cu"_2"O"$ and $"CuO"$. Oxide 1 $color(white)(mmmmml)"Cu" +color(white)(m) "O" → "Oxide 1"$ $"Mass/g":color(white)(l) 2.118color(white)(ll) 0.2666$ Our job is to calculate the ratio of the moles of...
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