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what is the number of ion in 7.41g of calcium hydoxide Ca(OH)2 ?

number of particles = mole x Avogadro constantAvogadro constant is 6.0 × 10 23 mol –1 .Mr of Ca(OH) 2 is 7.41g mol -1 mole = Mass / Mr = 7.41/7.41 = 1 moleThe question is asking: the number of ion = ?So, in ...
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Answered by Wai W. • Chemistry tutor
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There are 720 boys and 700 girls in a school. The probability that a boy chosen at random studies French is 2/3 The probability that a girl chosen at random studies French is 3/5. Work out the number of students in the school who study French.

The probability that a boy chosen at random studies French is 2/3. This is also a proportion. It says that for every 3 boys, you can say that 2 of them will study french. It is also close to 66% as it can be...
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Answered by Tutor132640 D. • Maths tutor
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How and why does Samuel Beckett create hopeless situations that parody reality in the play 'Waiting for Godot'?

Beckett talks about the theme of suicide consistently throughout the play, as the characters mull over their lives and existences. When Vladimir asks ‘What do we do now?’, Estragon replies quite casually ‘Wh...
MC
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What is the difference between the RPI and CPI rate of inflation

Both the Consumer Price Index (CPI) and Retail Price Index (RPI) are ways of measuring inflation which is the average change in price of a basket of goods. The RPI, however, includes the costs of housing suc...
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Answered by Ujjaval D. • Economics tutor
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How to approach close analysis of an unseen extract

Firstly, read the extract slowly once through, don't rush and attempt to begin analysis without getting a clear picture of the extract as a whole. Upon your second reading underline and annotate key words an...
SS
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