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macylen3900
04.10.2021 •
Chemistry
Iron has a density of 7.86g/cm^3. Could a block of metal with a mass of 18.2g and a volume of 2.56cm^3 be iron? Show work and explain.
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Ответ:
First calculate density of the the metal (should equal to density of iron)
Mass=18.2gVolume=2.56cm^3Metal is not iron
Ответ:
Mass=18.2g
Volume=2.56cm^3
=> Density =
=> Density=
=> Density=
Ответ:
8749.73× 10²³ atoms of He
Explanation:
Given data:
Number of atoms of neon = ?
Number of moles of neon = 1452.96 mol
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
1452.96 mol × 6.022 × 10²³ atoms of He/ 1 mol
8749.73× 10²³ atoms of He