1R= in chemistry.what is the calue of 1R
Answers
Answer:
8.3144598 J.mol
The value of R at atm that is at standard atmospheric pressure is R = 8.3144598 J. mol-1
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Answer:The mass of substance containing the same number of fundamental units as there are atoms in exactly 12.000 g of 12C.
I
1 atom of 12C weighs 12.000 amu
1 gram-atomic weight of 12C weighs 12.000 g
Alternative definition of the mole:
The atomic, molecular, or formula weight of the substance, expressed in grams.
The mole enables us to count atoms in the laboratory.
NA atoms/mole x 12 amu /atom = 12 g/mole
Simplifying, we obtain NA amu = 1 g. It follows that 1 m = 1/NA g = 1.660 x 10-24 g. Avogadro's number is an experimentally measured quantity. Although we are confident that we know its value quite well, some future experiment may cause us to make a small revision in the number. By necessity, the mass of 1 m in grams will change accordingly. This is not worrisome, because neither number is crucial to the utility of the mole.
1 molecule of glucose contains 6 atoms of C, 12 atoms of H, and 6 atoms of O;
1 mole of glucose contains 6 moles of C atoms, 12 moles of H atoms, and 6 moles of O atoms;
10 molecule of glucose contains 60 atoms of C, 120 atoms of H, and 60 atoms of O;
10 moles of glucose contains 60 moles of C, 120 moles of H, and 60 moles of O atoms;
Any amount of glucose contains equal numbers of C and O atoms, and twice this number of H atoms;
Any amount of glucose contains equal numbers of moles of C and O atoms, and twice this number of moles of H atoms.
NA molecules of glucose contains 6 x NA atoms of C, 12 x NA atoms of H, and 6 x NA atoms of O.
Example: How many moles of Fe are in 5.6 g Fe? How many Fe atoms are contained in the sample?
Solution: By definition, 1 mole of Fe is 56.0 g. 5.6 g Fe is therefore 0.1 mole of Fe. The number of Fe atoms in the sample is
0.1 mole x 6.022 x 1023 atoms/mole = 6.022 x 1022 atoms.
5.6 g of iron is not much iron. However, even this small amount conThe mass of substance containing the same number of fundamental units as there are atoms in exactly 12.000 g of 12C.
In their desire to be able to count atoms by weighing, chemists gradually developed the concept of the "gram-atomic weight", which was defined in exact correspondence with the atomic weight scale:
1 atom of 12C weighs 12.000 amu
1 gram-atomic weight of 12C weighs 12.000 g
Thus the gram-atomic weight of an element was defined as the atomic
Alternative definition of the mole:
The mole enables us to count atoms in the laboratory.
The dual definitions of the mole can be used to find the mass of 1 amu expressed in g. Exactly 12 g of carbon contains NA atoms, each weighing exactly 12 amu. In equation form,
NA atoms/mole x 12 amu /atom = 12 g/mole
Simplifying, we obtain NA amu = 1 g. It follows that 1 m = 1/NA g = 1.660 x 10-24 g. Avogadro's number is an experimentally measured quantity. Although we are confident that we know its value quite well, some future experiment may cause us to make a small revision in the number. By necessity, the mass of 1 m in grams will change accordingly. This is not worrisome, because neither number is crucial to the utility of the mole.
1 molecule of glucose contains 6 atoms of C, 12 atoms of H, and 6 atoms of O;
1 mole of glucose contains 6 moles of C atoms, 12 moles of H atoms, and 6 moles of O atoms;
10 molecule of glucose contains 60 atoms of C, 120 atoms of H, and 60 atoms of O;
10 moles of glucose contains 60 moles of C, 120 moles of H, and 60 moles of O atoms;
Any amount of glucose contains equal numbers of C and O atoms, and twice this number of H atoms;
Any amount of glucose contains equal numbers of moles of C and O atoms, and twice this number of moles of H atoms.
NA molecules of glucose contains 6 x NA atoms of C, 12 x NA atoms of H, and 6 x NA atoms of O.
Example: How many moles of Fe are in 5.6 g Fe? How many Fe atoms are contained in the sample?
Solution: By definition, 1 mole of Fe is 56.0 g. 5.6 g Fe is therefore 0.1 mole of Fe. The number of Fe atoms in the sample is
0.1 mole x 6.022 x 1023 atoms/mole = 6.022 x 1022 atoms.
5.6 g of iron is not much iron. However, even this small amount contains a huge number of iron atoms.