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Makovka662 [10]
2 years ago
10

Two chemicals are mixed together and a gas is produced. *chemical change physical change ​

Chemistry
1 answer:
givi [52]2 years ago
3 0

Answer:

chemical change

Explanation:

chemical change is when a substance combine with another substance to form a new substance.

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3 years ago
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Rufina [12.5K]
3.4 X 10^-2 because you start your equation with 2.5g in your (what we call train tracks). Then you have to find the GFM (gram formula mass) of KCl (potassium chloride). You find this by adding the average atomic mass of each element. Potassium's is 39.10 and Chlorine's is 35.45 which gives you a total of 74.55 grams per mol. so now that you have found the GFM you plug that number into the diagonal bottom in order to cancel the gram units. Then you would place 1 mol KCl on top because that is the unit you want. Finally you will divide your original 2.5 by the GFM of 74.55 to get an answer of 0.033534 mol KCl... but since sig figs matter your final  answer will be 3.4 X 10^-2
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Nadusha1986 [10]

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