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Chemistry
GCSE

An equation for the reaction is: NiO + C = Ni + CO Calculate the percentage atom economy for the reaction to produce nickel. Relative atomic masses (Ar): C = 12 Ni = 59 Relative formula mass (Mr): NiO = 75 Give your answer to 3 significant figures.


Atom economy is a percentage value which tells you how efficient the product is in comparison to the amount of reactant used.Equation to learn: atom economy = Ar of useful product/A...

Answered by Peter Rory H. Chemistry tutor
2274 Views

Calculate the concentration of Sodium Chloride, NaCl, if you have 0.0010 moles in 55cm^3

Most important Chem equation to know: moles = concentration x volumerearrange the equation as you want to find out the concentration: concentration = moles/volumesubstitute in the...

Answered by Peter Rory H. Chemistry tutor
1254 Views

A student needs 0.2 moles of hydrochloric acid to conduct a reaction. How many milliliters of a 0.5 M HCl solution does the student need?

The student needs 0.2 moles of the reactant and is supplied with the 0.5 molar solution. To work out the number of milliliters needed, the student needs to divide the number of moles by the molarity and m...

Answered by Zuzanna G. Chemistry tutor
989 Views

Explain why the noble gases are inert.

Atoms in group 8 have a full outer electron shell. This means they don't have a tendency to lose, gain or share electrons with other elements to achieve a full outer shell. This explains why they don't fo...

Answered by Christina P. Chemistry tutor
1597 Views

What is the difference between atom economy and percentage yield?

First I will start by defining the two terms. Atom economy is calculated by dividing the total relative molecular mass of the desired product over the total relative molecular mass of the reactants. You c...

Answered by Vahgisha T. Chemistry tutor
3707 Views

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