Answer:
In this problem,it is very important to use the constant called Avogradro's number which is equal to 6.022 * 10^23 particles per mole. For any kind of substance, whatever it is, this is the number of particles that constitute 1 mole.
This means that 6.022x10^23 grains is equivalent to 1 mole of rice grain.
1.807*10^24 grains (1 mole/ 6.022*10^23) = 3 moles of rice grains
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