The solubility of potassium chloride at 60 C is 45.50g in 100g of water In an experiment, 45.50g of potassium chloride is added to 100g of water at 60 C
1. state the total mass of potassium chloride and water used
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explanation:

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While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.