Question

How many grams of neon will have the same number of atoms as 4g of calcium?

Answer 1

Heya!

Here is your answer!
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Mass of 1 atom of Ne = 20/6.022*10²³ g

Now,

Number of particles in 4 g of Ca,

= 4/40*6.022*10²³

= 6.022*10²² atoms

Therefore, number of atoms of Ne same as 4 g of Ca 

= 20*6.022*10²²/6.022*10²³

=20/10

=2g

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~Hope it helps!~

Answer 2

Atomic mass of calcium= 40
Atomic mass of neon is = 20

No of atoms of calcium in 4g sample
Is 6.023 ×10²³ × 4/40 => 6.023×10²²

now no. Of atoms of neon is also same this no of moles of neon is
6.022×10²² atoms will be
n = 6.022×10²²/6.022×10²³
= 0.1 mole
Thus mass of neon will be
M = 0.1×20 => 2 gram .