Question

the atomic number of neon is 10. the atomic number of calcium is 20. compared with a mole neon, a mole of calcium contains
A. an equal number of atoms
B. part of a chemical bond
C. half as many atoms
D. twice as many atoms

Answer 1

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Answer 2

Do you know the definition of a mol? From there, we can answer the question

Answer 3

The mass of substance containing the same number of fundamental units as there are atoms in exactly 12.000 g of 12C. Fundamental units may be atoms, molecules, or formula units, depending on the substance concerned. (this is what google says.)

Answer 4

OK, so what you said is "same number of fundamental units as there are atoms in exactly 12.000 g of 12C " (so this is a set number, which just happens to be 6.022 x 10^23 atoms)

So from your answer choices if you have a mol of neon and a mol of calcium, what can you say about the number of atoms, based on the definition you gave me of mol

Answer 5

Focus on the atoms and nothing else, since this is what the question is asking for

Answer 6

Wouldn't it be twice as many?

Answer 7

I can see where the confusion comes from, the definition of a mol is just a set number of atoms so a mol of calcium is 6.022 x 10^23 atoms and a mol of neon is the SAME number of atoms

Answer 8

thank you

Answer 9

You got it?

Answer 10

I will say while the amount of atoms are the same no matter if you have a mol of element of x or elelment y, the molar mass (Which is the atomic number times 1 mol/g of the substance) gives you different numbers

SO the molar mass of calcium is gonna twice that of neon

Answer 11

thanks