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If you have 20.82g of Lithium (Molar mass = 6.34gmol^-1), how many moles of Li is it?

number of moles = mass / molar massTherefore, n=20.82g/6.34gmol -1 =3moles
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Answered by Sam H. • Chemistry tutor
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Define enthalpy of neutralisation and state standard conditions:

Enthalpy of Neutralisation: the energy change a system experiences when one mole of water is formed from the neutralisation of an acid with an alkali under standard conditions.Standard conditions: 298K, 1atm...
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Answered by Sam H. • Chemistry tutor
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Increase 35 by 20%:

An increase by 20% is the same as multiplying by 1.2Therefore, 35 x 1.2 = 42
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Answered by Sam H. • Maths tutor
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Differentiate: f(x)=2(sin(2x))^2 with respect to x, and evaluate as a single trigonometric function.

f(x) = 2sin 2 (2x)Therefore, using the chain rule: f'(x)=2 x 2cos(2x) x 2sin(2x)(The 2 at the front arises from the constant 2, at the start of f(x), the 2cos(2x) comes from differentiating sin 2 (2x), then ...
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Answered by Sam H. • Maths tutor
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State Newton's 1st Law:

An object will remain at rest or constant velocity if all the forces acting upon it are equal (net force=0N).
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Answered by Sam H. • Physics tutor
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