A chemistry problem by Karthik Rocks

Chemistry Level 1

What is the weight of Calcium Oxide (in grams) formed by burning 20 g of Calcium in excess of Oxygen?

28 36 56 72

Karthik Rocks by Karthik Rocks , 22, India

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2 solutions

Harsh Shah
Nov 10, 2014

CaO + O2= CaO.....Ca=40gm O2=16*2 and CaO=56gm...Okey so we get 56 gm CaO from 40 gm Ca. So we get 28 gm CaO

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Mayur Ade
Nov 2, 2014

2Ca +O2 --->@CaO
80 grams ca reacts with 112 grams . Hence 20 grams will react with 28 grams of CaO

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explanation was absolutely correct but instead of "@" it must be 2

actual reaction : 2 Ca + O2 ---> 2CaO

Karthik Rocks - 6 years, 7 months ago

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