How many moles are contained in 3.131 × 1024 particles?

One mole contains 6.02×10²³
If x mole contains 3.131×10²⁴

x = 3.131×10²⁴

6.02×10²³

x = 0.52×10²⁴¯²³

x = 0.52×10¹

x = 5.2moles

Hope this helped...?

The answer is not c

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged