Enter your answer in the provided box. the atomic masses of 63cu (69.17 percent) and 65cu (30.83 percent) are 62.94 and 64.93 amu, respectively. calculate the average atomic mass of copper. the percentages in parentheses denote the relative abundances.

The average atomic mass of copper is 63.55 amu.

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

  .....(1)

Mass of isotope = 62.94 amu

Percentage abundance of = 69.17 %

Fractional abundance of isotope = 0.6917

Mass of isotope = 64.93 amu

Percentage abundance of = 30.83 %

Fractional abundance of isotope = 0.3083

Putting values in equation 1, we get:

Hence, the average atomic mass of copper is 63.55 amu.

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.