Chemistry, 10.07.2019 17:00 samm2002

An alka-seltzer tablet contains 324 mg of aspirin (c9h8o4), 1904 mg of nahco3, and 1000. mg of citric acid (h3c6h5o7). (the last two compounds react with each other to provide the "fizz," bubbles of co2, when the tablet is put into water.) calculate the amount (moles) of each substance in the tablet.

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Answer from: bella219rose

Number of moles of a substance can be calculated from mass of the substance and its molar mass as follows:

$n=\frac{m}{M}$

Here, n is number of moles, m is mass and M is molar mass.

For aspirin: 324 mg

Molecular formula is $C_{9}H_{8}O_{4}$ and molar mass of aspirin is 180.157 g/mol, thus, number of moles will be:

$n=\frac{324\times 10^{-3} g}{180.157 g/mol}=0.0018 mol$

For sodium hydrogen carbonate: 1904 mg

Molecular formula is $NaHCO_{3}$ and molar mass is 84.007 g/mol, thus, number of moles will be:

$n=\frac{1904\times 10^{-3} g}{84.007 g/mol}=0.0226 mol$

For citric acid: 1000 mg

Molecular formula is $H_{3}C_{6}H_{5}O_{7}$ and molar mass is 192.124 g/mol, thus, number of moles will be:

$n=\frac{1000\times 10^{-3} g}{192.124 g/mol}=0.0052 mol$

Therefore, number of moles of aspirin, $NaHCO_{3}$ and citric acid in the tablet is 0.0018 mol, 0.0226 mol and 0.0052 mol respectively.

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

cock topography

the study of the surface of a large voluptuous cock.

look at that sorostitute right she's a cock topographer!

what classes are you taking this

cock topography!

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An alka-seltzer tablet contains 324 mg of aspirin (c9h8o4), 1904 mg of nahco3, and 1000. mg of citri...

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