Chemistry, 24.10.2019 15:43 jeffylovesgreenbeans

Which of the following has the greatest mass, in grams? 1 atom of gold (au) 0.5 mol lead (pb) atoms 2.0 mole of chlorine (cl) atoms 25 atoms of mercury (hg)

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The atomic mass of each element from the periodic table can help you find those masses. The atomic mass is the molar mass of 6.02 x 10^23 atoms of that element, so...

A. Atomic mass of Au is 196.97 g/mol. Dividing by the Avogadro constant (6.02 x 10^23), or 1 mol of atoms, would give you the weight in grams for one atom of gold: 3.27 x 10^-22

B. The atomic mass of mercury is 200.59 g/mol, so one mol of mercury would weigh 200.59 g.

C. Chlorine weighs 35.45 g/mol, so two mols would be twice that, or 70.90 g.

D. We know that 6.02 x 10^23 atoms are more than 25 atoms of mercury, so D would already be far less than B, but let's do the calculations just in case. 1 mol of Hg weighs 200.59 g/mol, divide by Avogadro's number to get the weight per atom (3.33 x 10^-22 g), and multiply by 25 - 8.33 x 10^-21 g.

By the results, we can see that 1 mol of Hg has the greatest mass of all the possible choices. Generally, the weight of one or a few single atoms is minuscule, so we could have eliminated A and D immediately, but it's good to understand and do the math,

Answer from: Quest

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.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

1. o2(g)as a product

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Which of the following has the greatest mass, in grams? 1 atom of gold (au) 0.5 mol lead (pb) atoms...

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