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Calculate the relative formula mass (Mr) of BaCO3

So relative formula mass (M r ) just means the total mass of all the atoms within our molecule. So lets work out how many of each atom we have: Ba - 1, C - 1, O - 3Now we know the relative atomic mass of eac...
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Answered by Max H. • Chemistry tutor
11703 Views

Solve 2x-5=3x+4

2x-5=3x+4 Firstly, you move the +4 to the other side (-5-4=-9). The equation should now look like: 2x-9=3x. You then move the 2x to the other side (3x-2x=x) so your answer would be x=-9
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Answered by Amelia W. • Maths tutor
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How do I approach the time conditions of a history essay?

The strict time conditions of a GCSE history essay are one of the most taxing aspects of the exam. The examiners want to see that you can present a clear and concise argument with specific and relevant conte...
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Answered by Grace E. • History tutor
3155 Views

A lorry can travel 35 miles per litre of diesel that costs £7.30 per litre. What is the cost in £ (to the nearest 2 decimal places) of the diesel used in driving the lorry 200 miles?

Firstly, we want to start off by calculating how many litres of diesel the lorry uses when it drives for 200 miles. We know that with 1 litre of diesel, the lorry can drive for 35 miles. Knowing this, we can...
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Answered by Robert F. • Maths tutor
4082 Views

What is electricity

A transfer of energy via a current
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Answered by Andrew G. • Physics tutor
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