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Calculate the mass of 7.23 moles of CH​​​​​​​4

Molar mass of CH 4 = 12 + 4(1) = 16 mass = Mr x moles mass = 16 x 7.23 mass = 115.68g = 116g (3sf)
MP
Answered by Misha P. • Chemistry tutor
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Is knowledge true justified belief?

The idea that knowling something is the same as having a true justified belief has been around since Plato. However, in 1963 Edmund Gettier demonstrated that not all true jusfied beliefs count as knowledge. ...
JT
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By forming and solving a suitable quadratic equation, find the solutions of the equation: 3cos(2A)-5cos(A)+2=0

3cos(2A)-5cos(A)+2=0. The first thing we do is use a trignometric identity, namely cos(2A) = 2(cos^2(A))-1. This gives us a new form of the original equation. 3(2(cos^2(A))-1)-5cos(A)+2=0: we expand out the ...
JB
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Expand (x-5)(x+6)

expand the brackets X 2 + 6x - 5x - 30 2) collect like terms X 2 + x - 30
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Answered by Misha P. • Maths tutor
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What is a priori knowledge?

A priori knowledge is knowledge that can be acquired without having to 'look at the world'. A priori knowledge is independent of the empirical world in two ways: i) it's truth does not depend on anything hap...
JT
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