How would your calculations for the mass of Mg metal present in the sample have

Question

How would your calculations for the mass of Mg metal present in the sample have been affected (if at all) by the fallowing observations? Clearly explain your reasoning fo reach answer. 1. Your instructor had inverted two numbers when reading the pressure and reported wha the barometric pressure was 754 torr when in fact the correct room pressure was 745 torr. 2.Your partner had tightly held the gas-filled porition of the buret in his hand while you were trying to determine the difference in the water levels. 3. An edge of the Mg ribbon was outside the buret and some hydrogen may have escaped 4 You did not correct for the difference in water levels.

Explanation / Answer

1. Since the pressure recorded is less than original pressure so the mass of Mg metal recorded is less as the mass of Mg metal is directly proportional to the barometric pressure recorded.

2. Since your partner had tightly held the gas-filled porition of the buret in his hand while you were trying to determine the difference in the water level the correct difference cannot be attained so there may be a difference in calculated value of Mg.

3. An edge of the Mg ribbon was outside the buret and some hydrogen may have escaped therefore amount of Mg reacted is less hence the calculated value of Mg will be less.

4. You did not correct for the difference in water levels so the mass of Mg will is directly depending upon difference in water level which gives the volume. If the difference in water level is not corrected then the value of mass of Mg would also be incorrect.

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