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propene and steam react to form propan-2-ol. If the yield is 75% what mass of propene is required to produce 410g of propane-2-ol. [molar masses/gmol-1 propene=42, propan-2-ol =60]

remember the equation moles = mass/molar mass . We have the final grams of product and also the molar mass so we can calculate the number of moles we got from this. [410/60=6.83moles] It is asking for a 75% ...
JW
Answered by Jasmine W. • Chemistry tutor
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Functions question: f(x) = 3x + 2a; g(x) = ax + 6; fg(x) = 12x + b. a and b are constants; Work out the value of b

So this is a functions question which is essentially asking you to combine the first two functions and then equate them with the last one. fg(x) can be considered as replacing the x in f(x) with g(x): fg(x) ...
RP
Answered by Ritik P. • Maths tutor
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Explain how an individual develops immunity following infection by a bacteria

When an individual is exposed to the bacterial pathogen and its antigen, it causes activation of the body's own immune response. When the immune response is initiated, the pathogens are destroyed by T killer...
KM
Answered by Kathryn M. • Biology tutor
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How does temperature affect enzyme activity?

Enzymes are biological catalysts which speed up the rate of reactions. They are specific to their substrate (seen in the lock and key model) and form enzyme-substrate complexes. At low temperatures the enzym...
LJ
Answered by Lily J. • Biology tutor
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Explain the term Economies of Scale. You may use a diagram to help.

Economies of scale is a term used to describe the point at which is a business' operations have grown to a scale that they can operate at a lower unit cost due to reasons such as buying in bulk. This means t...
RL
Answered by Ryan L. • Economics tutor
2448 Views