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kirza4 [7]
3 years ago
11

Classify the following statements regarding the law of mass conservation as true or false.

Chemistry
1 answer:
Ahat [919]3 years ago
8 0
True true false true
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In a science experiment, Javi concludes that a chemical reaction has occurred. What evidence would support this conclusion?
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1) Compund Ir (x) O(y)

2) Mass of iridium = mass of crucible and iridium - mass of crucible = 39.52 g - 38.26 g = 1.26 g

3) Mass of iridium oxide = mass of crucible and iridium oxide - mass of crucible = 39.73g - 38.26g = 1.47g

4) Mass of oxygen = mass of iridum oxide - mass of iridium = 1.47g - 1.26g = 0.21g

5) Convert grams to moles

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moles of oxygen = mass of oxygen / molar mass of oxygen = 0.21 g / 15.999 g/mol = 0.0131

6) Find the proportion of moles

Divide by the least of the number of moles, i.e. 0.00656

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=> Empirical formula = Ir O2 (where 2 is the superscript for O)

Answer: Ir O2
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