Question

1. A student carried out a reaction between sodium bicarbonate and nitric acid three times. The masses of the samples of sodium bicarbonate were 0.0398 g. 39.89 mg and 39.986 mg. Calculate the average mass. Select one a 39.9 mg O b. 0.0400 g C.39.892 mg d 39 89 mg e. 119.7 mg in state INCORRECT

Answer 1

answer is a i.e. 39.9mg. in the given samples one sample have one decimal place (least), answer should be least number of places,

so answer is 39.9mg, with one decimal place.

39.8mg + 39 89 mg + 39.98699 3 Samples 0:0 Sodium bicarbonate Samples mass, Given 03989, 39.89 mg 39.986 mg To take average, Convert all in same units. 19 = looong we know that 0.03989X/1000 mg 34 'བ། = 39.8 mg 19 Total mass = 119.676mg Average mass = Tota mass of Samples number of Sarpies 119.676 mg = 39.892 mg 3 when multiplying (68) dividing the answer is the same herber of decimal places as the least huviber of decimal places in the given probleme.

39.8 mg 39.89 mg 1 decimal place, - 2 decimal Places > decimal places Answer should be 39.986 rg 1 decimal place. A Verage mass = 39.892 mg = 39.9 ing Answer: 39.9mg