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Dima020 [189]
3 years ago
7

14. הכניסו בקבוק מים במסה של 100 גר' לתוך מקפיא, מה מסתו של הקרח לאחר שהמים קפאו ?

Chemistry
1 answer:
Andrei [34K]3 years ago
8 0

Answer:

whattt, can u write it in English so i can help you

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Name the following compound with a polyatomic ion: Na₂SO₄ *
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Answer:

sodium sulfate

Explanation:

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4 0
3 years ago
2.50 g of Zn is added to 5.00 g of HCl
Debora [2.8K]
Zn+2HCl ----> 2ZnCl2 + H2

For 2.50 g of Zn

Mass per mol = 2.50/molar mass of Zn = 2.50/65.38 = 0.0382 g/mol
There are two moles of ZnCl2 and total mass = 2*0.0382*molar mass of ZnCl2 = 2*0.0382*136.286 = 10.42 g

For 2 g of HCl

Mass per mol = 2/2*molar mass of HCl = 2/ (2*36.46) = 0.0274 g/mol
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It can be noted that 2 g of HCl produced less amount of ZnCl and thus it is the limiting reagent.
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