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If 350gNaCl is dissolved in water and made up to a volume of 3dm^3, calculate the concentration of the solution.

Moles= Mass/Mr Mol (NaCl)= 35/(23+35.5)=350/58.5=0.6Concentration= Moles/volumeConc(NaCl)= 0.6/3=0.2mol/dm 3
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Answered by Lucy P. • Chemistry tutor
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The perimeter of a right-angled triangle is 60 cm. The lengths of its sides are in the ratio 3 : 4 : 5. Calculate the area of the triangle.

We are given ratios of side lengths and the total perimeter. The perimeter of the triangle is simply the sum of the side lengths. Imagine that the sides are made up of "units": 3 times a unit + 4 t...
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Answered by Viktoria N. • Maths tutor
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How do I solve a sum of equations with unknowns in the denominator?

First, you need to make sure that each equation has a common denominator. You do this by multiplying the numerators of each equation with the denominators of the others. This allows you to form one algebraic...
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Answered by Kai H. • Maths tutor
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Solve algebraically for a and b: 6a+b=16, 5a-2b=19

Multiply equation 1) by 2 : 12a+2b=32. There are alternate signs of b and so therefore add the equations together: 17a=51. Solve for a: a=3. Sub a into one of the equations to find b: 5*3-2b=19b=-2. The fina...
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Answered by Sorcha S. • Maths tutor
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How do you answer the 4 markers in the Geography exam?

These are marked through response marking and how the student formats their answer. You need to state two points and elaborate upon them to achieve full marks. For example: explain how global warming can be ...
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Answered by Millie N. • Geography tutor
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