14. How many grams of KCI (79.50g/mol) are dissolved in i L to make a o.1 M anal

Question

14. How many grams of KCI (79.50g/mol) are dissolved in i L to make a o.1 M analytical 0 concentration? a) 79.500g (b) 7.9500 g (c) 0.7950 g (d) 0.0080g 15. Which methods listed below are used in measuring accuracy of the data? (a) Absolute and relative error (b) Standard deviation and relative error. (c) Standard deviation and variance (d) Standard deviation and absolute error. 16. For a galvanic cell, which of the following statements is never true? a) The electrons flow in the external circuit from the anode to the cathode. b) Reduction takes place at the cathode. cathode is higher th

Explanation / Answer

14 . Concentration = no of moles ÷ volume of solution in litre

No of moles (n) = concentration * volume = 0.1 * 1 = 0.1

Mass of KCl = n * molar mass = 0.1 * 79.50 = 7.9500 g

Option b is correct

15. absolute and relative error are used in measuring accuracy of the data. Standard deviation is used in measuring the precision of data .

so option a is correct

16. option c is correct

the potential of cathode is higher than that of anode is never true

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