How many atoms of oxygen are in 350 mg of calcium nitrate? 2.07 × 1026 9.48...

Question

Question

How many atoms of oxygen are in 350 mg of calcium nitrate?

2.07 × 10²⁶

9.48 × 10²⁵

7.7 × 10²¹

2.1 × 10²⁶

1.3 × 10²¹

Answer 1

Answer #1

mass of calcium nitrate = 350 mg = 0.350 g

number of moles of calcium nitrate = 0.350 g / 164.088 g/mol = 0.00213 mole

1 mole of calcium nitrate = 6.023*10^23 atoms so

0.00213 mole of calcium nitrate =

= 0.00213 mole of calcium nitrate *(6.023*10^23 atoms / 1 mole of calcium nitrate)

= 1.28*10^21 atoms

Therefore, the number of atoms of calcium nitrate = 1.28*10^21

Answer 2

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