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##### Asked by: Shiloh Ossenbrink

business and finance environmental services industry# How do you count grains of rice?

**Calculate the mass of a grain of rice**

- Weigh out exactly 10 g of
**rice**. **Count**the number of**grains of rice**youweighedout.**Count**again to make sure.- Divide 10 g by the number of
**rice grains**. This givesanestimate of the mass of one**grain of rice**in g. - Take this number and multiply it by 1000.

Likewise, people ask, what is the mass of a grain of rice?

A single long **grain of rice** weighs an averageof0.029 grams.

Similarly, how many grains of rice is a cup?

One **cup** of uncooked **rice** isabout175–185 grams. One gram of **rice** has around48**grains**. So a **cup** of 180 grams has 8640 **grainsofrice**.

Avogadro tells us that we have 6.023 x 10^23 SiO2unitsper gram, so there would be 6.023 x 10^23 / 60 ≈ 1 x10^22SiO2 units in a gram of pure SiO2, and with SiO2 composed of3**atoms**, that puts us at 3 x 10^22 **atoms** per gramofSiO2. Now, a **grain of sand** does not weigh 1 gram. Itweighsless.