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How Many Molecules Are There in a Grin of Silica Sand?

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How Many Molecules Are There in a Grin of Silica Sand? To answer the question, how many molecules are there in a grain of silica sand?, you can use the same principle as when calculating the number of molecules in a piece of paper. A grain of sand has a volume of 0.001 cm3 and a relative molecular mass of 64. This means that there are two times as many atoms in a grain of sand as there are in all of the world’s population.

A grain of sand is the smallest thing on earth and contains less than 0.03% water. So a rough estimate of sand’s density would be too difficult. But, if we want to get an accurate answer to the question, we should remember that atoms are separated by a few Angstroms. In fact, 50 million of them are scattered around a centimetre.

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A grain of sand is composed of silicon dioxide (SiO2), a mineral with the formula SiO2. Silica consists of two chemical elements: silicon and oxygen. Both elements weigh approximately 28 atomic units. Combined, they total 60 atomic units. This means that one gram of sand contains more than 6.023 x 1023 atoms.

Earth’s beaches are estimated to contain 7.5 x 1018 grains of sand. This means that there are roughly five hundred quadrillion grains of sand on Earth. In fact, half of those grains are atoms. That makes the grains of sand nearly half as dense as a human hair. So, the answer is 163 billion grains per square metre of beach.

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Conclusion

So how many molecules are there in a grain of sea sand? According to scientists, Earth has approximately 7.5 sextillion grains of sand. This means that each grain of sand contains more molecules than stars in the Universe. A grain of sea sand is approximately one-sixth the size of an atom. This is staggering. What’s more, a grain of sea sand contains more molecules than the planet Mercury.

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