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If 350g of NaCl is dissolved in water to a final volume of 3dm . Calculate the concentration of the solution.

first, write down the mass, Mr and calculate the moles of NaCl.mass = 350gMr = 24.0 + 35.5 = 58.5mol = mass/Mr = 350/58.5 = 5.98 (3s.f)now calculate the concentration in 3dm3 of watervol = 3mol = 5.98conc = ...
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Answered by Adam D. • Chemistry tutor
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In theory, what should happen if there is excess supply for a good, what should happen?

a) prices remain constantb) suppliers will increase pricec) consumers will demand mored) suppliers will reduce pricethe answer would be D as the supply increases, this causes a rightwards shift in supply, wi...
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Answered by Adam D. • Economics tutor
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simplify the following equation: 3a x 4ab

Thinking about each term individually, we can rewrite the equation as:3 x a x 4 x a x b = then we can multiply the numbers: 3 x 4 = 12then multiply the letters: a x a = a2 (a squared) x bnow join everything ...
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Answered by Adam D. • Maths tutor
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Solve the simultaneous equations: 5x + y = 21 and x - 3y = 9

label equation 5x + y = 21 as (1) and equation x - 3y = 9 as (2) multiply equation (2) by 5 to get : 5x - 15y = 9 (3) then subtract equation (1) from equation (2) in order the eliminate the x variable -16y =...
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Answered by Shruti G. • Maths tutor
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Factorise x^2+3x+2=0

Using the letters a,b and c we label our coefficients by comparing our equation to ax^2+bx+c=0. This means we have; a=1, b=3 and c=2.To factorise a quadratic equation we need to put it into the form (x+ )(x+...
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Answered by Daisy A. • Maths tutor
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