⁷⁰₂₉Cu
Explanation:
Copper-70 isotope in nuclide form.
A nuclide is designated as: ₙᵇX
Where X is the symbol of the atom
b is the mass number of the atom
n is the atomic number
Mass number is the number of protons and neutrons in an atom. These particles makes up the bulk of the mass of an atom.
Atomic number is the number of protons in an atom. For neutral atom, it is the same as the number of electrons.
To write Copper-70 in nuclide format:
Symbol of Copper is Cu
Mass number is 70
Atomic number from periodic table is 29
⁷⁰₂₉Cu
Learn more:
Atomic number brainly.com/question/5425825
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Answer:
3.1 moles of ammonia
18.67× 10²³ molecules
Mass = 52.7 g
Explanation:
Given data:
Number of atoms of hydrogen = 5.68×10²⁴ atoms
A) Number of molecules of ammonia = ?
Solution:
First of all we will calculate the number of moles of hydrogen.
1 mole = 6.022× 10²³ atoms
5.68×10²⁴ atoms × 1 mol / 6.022× 10²³ atoms
0.94×10¹ mol
9.4 moles of hydrogen
Moles of ammonia:
3 moles of hydrogen are present in one mole of ammonia.
9.4 moles of hydrogen = 1/3×9.4 =
3.1 moles of ammonia
Number of molecules of ammonia:
1 mole contain 6.022× 10²³ molecules.
3.1 mol × 6.022× 10²³ molecules / 1 mol
18.67× 10²³ molecules
c) Mass of sample = ?
Mass = number of moles × molar mass
Mass = 3.1 moles × 17 g/mol
Mass = 52.7 g
I believe it is BaS I hope this helps!
Mass number is
protons + nuetrons
So,
7 + 8 = 15
——-
Atomic number is the number of protons
so,
7
Answer:
THE CORRECT ANSWER IS COMMAND.HOPE IT HELP YOU
