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gladu [14]
3 years ago
13

Student mixes 5 g of sand into a beaker of 20 g of water. Is this a physical or chemical change-why?

Chemistry
1 answer:
jek_recluse [69]3 years ago
6 0
Physical because it doesn't do with fire
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  • To understand how to solve this problem, we must mention the reaction equation where water produced from PbO₂.

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  • Now, it is a stichiometric oriented problem, that 1 mole of PbO₂ produces 2 moles of H₂O.

Using cross multiplication:

1.0 mole of PbO₂ → 2.0 moles of H₂O

5.43 moles of PbO₂ → ??? moles of water

The moles of water produced = (5.43 x 2.0) = 10.86 moles ≅ 10.9 moles.

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