sequoyaburke
15.02.2020 •
Chemistry
9. Which sample contains a mole of atoms?
A) 23 g Na
B) 24 g C
C) 42 g Kr
D) 78 g K
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Ответ:
Sodium (Na) is the sample that contains a mole of atoms.
Given the following data:
Mass of Na = 23 gMass of C = 24 gMass of Kr = 42 gMass of K = 78 gScientific data:
Molar mass of Na = 23 g/mol.Molar mass of C = 12 g/mol.Molar mass of Kr = 83.798 g/mol.Molar mass of K = 39.098 g/mol.To determine the sample contains a mole of atoms:
Number of moles = 1.0 moles
Therefore, sodium (Na) is the sample that contains a mole of atoms.
Read more on number of moles here: link
Ответ:
option A. 23g Na
Explanation:
To know which of the options are correct, let's solve each of the options
A. Mass of Na = 23g
MM of Na = 23g/mol.
n = Mass /Molar Mass
n = 23/23 = 1mole
B. Mass of carbon = 24g
MM of carbon = 12g/mol
n = Mass /Molar Mass
n = 24/12 = 2mole
C. Mass of Kr = 42g
MM of Kr = 84g/mol
n = Mass /Molar Mass
n = 42/84 = 0.5mole
D. Mass of K = 78g
MM of K = 39g/mol
n = Mass /Molar Mass
n = 78/39 = 2mole.
From the above illustration, only 23g of Na contains a mole of the atom
Ответ:
hope this helps!