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How many grams of neon will have the same number of atoms as 4 g of calcium?
(atomic masses : Ne=20 u, Ca =40 u )

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Answer 1

The atomic mass of n eon is 20u, so 1 mole of neon will be equal to 20 grams. Thus, 2 grams of neon will contain the same number of atoms as 4 grams of calcium.

Answer 2

$\huge\bold{Question:}$

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

( Atomic masses : Ne = 20 u, Ca = 40 u )

$\huge\bold{Answer:}$

1)

• First convert 4 grams of calcium into moles-
• The atomic mass of calcium is 40 u, so 1 mole of calcium is 40 grams.

Now,

40 g of calcium = 1 mole

So,

4 g of calcium -

$\frac{1}{40} \times 4 \\ \\ \frac{1}{10} \: mole$

• Now, 1/10 mole of calcium will have the same number of atoms as 1/10 mole of neon.

• So, we should now convert 1/10 mole of neon into mass in grams.

2)

• The atomic mass of neon is 20 u, so 1 mole of neon will be equal to 20 grams.

Now,

1 mole of neon = 20 g

So,

$\frac{1}{10} \: mole \: of \: neon \: = 20 \times \frac{1}{10}$

2 g

Thus, 2 grams of neon will contain the same number of atoms as 4 grams of calcium.