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The composition by mass of a compound is: C=36.4%, H=6% and F=57.6%. Calculate the empirical formula. If the RFM is 66, what is the molecular formula?

Calculate the moles of each of the 3 elements (to get C=3.03, H=6, F=3.03). Divide these by the smallest mol calculated to get the ratio of the elements. This will get C:H:F as 1:1.978:1 = 1:2:1 and so the e...
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Answered by Sara T. • Chemistry tutor
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A runner of weight 588N runs at a speed of 8 miles/hr. What is the kinetic energy of the runner? Determine the power exerted by the runner over a distance of 10m.

KE = 1/2 m v^2m = 588/9.8 = 60 kgv = 8 miles/hr = 3.56 m/sKE = 379 JP = E/tt = d/v = 10m/3.56m/s = 2.81 sP = 135 W
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Answered by Eliza D. • Physics tutor
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Describe the 3 overall stages of the cell cycle and the processes ongoing during the cell's life.

The cell cycle is composed of 3 main stages: 1) Interphase During the interphase stage of the cell cycle, the cell grows and organelles such as mitochondria and ribosomes double. The DNA also multiplies to f...
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Answered by Yousif A. • Biology tutor
110724 Views

How does Philip Larkin create humour in his poem 'This Be The Verse'?

People often find it quite hard to write about humour in exams – in all the analysis that is expected of you, it can be easy to forget that things can be funny! Larkin’s ‘This Be The Verse’ is typical of his...
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How do you calculate the area of a triangle when the question tells you the length of all three sides but no angles?

use the cosine rule to get angle A; cos(A) = (b 2 + c 2 - a 2 )/2bc2) Use '1/2 x a b x sin(C)' to get the area of the triangleNote: the side 'a' is the one opposite angle A
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Answered by Tom H. • Maths tutor
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