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Molar mass of CH₄ = 12 + 4(1) = 16 mass = Mr x moles mass = 16 x 7.23 mass = 115.68g = 116g (3sf)

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 knowledg...

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 expan...

1. expand the brackets X² + 6x - 5x - 30 2) collect like terms X² + x - 30

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 ...