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How do you calculate the number of moles of CO2 molecules if the mass is 22g

Firstly, you need to understand that mass= moles x relative formula mass. Using this equation and the understanding of the periodic table, you can work out the relative atomic mass of carbon which is 12 and ...
CC
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With reference to two examples, drawn from different regions, discuss the claim that the ruler's identity was more important to single-party states than their policies.

The personality cults of Mao Zedong and Adolf Hitler were highly important to controlling their respective states, as they established a level of informal, "soft" power throughout both their partie...
ET
Answered by Euan T. • History tutor
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write 2(sin^2(x)- cos^2(x)) + 6 sin(x) cos(x) in terms of cos(2x) and sin(2x)

We use the following double angle formulae cos(2x) = cos^2(x) - sin^2 (x) and sin(2x) = 2sin(x)cos(x) to see that 2(sin^2(x)- cos^2(x)) + 6 sin(x) cos(x) = -2-(sin^2(x)+ cos^2(x)) + 3*2 sin(x) cos(x) = -2cos...
NR
Answered by Nicola R. • Maths tutor
5953 Views

What do I do if I can’t decided between two answers on the multiple choice?

The multiple choice section can be really difficult, and although this probably isn’t what you want to hear, it’s often just a case of trusting your gut. Don’t spend too long on the question- whichever one m...
ST
Answered by Suzanne T. • LNAT tutor
1843 Views

Factorise and solve x^2 -4x -12=0

x 2 - 4x -12 is a quadratic equation with a general formula. It can be factorised by into brackets and solved.By looking at the equation, the last term is negative so one number in the factorised form must b...
MM
Answered by Mitchel M. • Maths tutor
9839 Views