# Chemistry calculation help

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#1
Can someone help me on this question please:
Mass of zinc needed to make 1.62 g zinc oxide when zinc is heated in the presence of oxygen (2Zn + O2 → 2ZnO) is

thanks.
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#2
Can someone help me on this question please:
Mass of zinc needed to make 1.62 g zinc oxide when zinc is heated in the presence of oxygen (2Zn + O2 → 2ZnO) is
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#3
Can someone help me on this question please:
Mass of zinc needed to make 1.62 g zinc oxide when zinc is heated in the presence of oxygen (2Zn + O2 → 2ZnO) is
0
5 months ago
#4
Can someone help me on this question please:
Mass of zinc needed to make 1.62 g zinc oxide when zinc is heated in the presence of oxygen (2Zn + O2 → 2ZnO) is
0
5 months ago
#5
Can someone help me on this question please:
Mass of zinc needed to make 1.62 g zinc oxide when zinc is heated in the presence of oxygen (2Zn + O2 → 2ZnO) is
Use the molar mass and mass of zinc oxide to find the number of moles in Zinc oxide
Compare the ratios of zinc oxide to zinc
In this case 1:1 so the moles are the same
Using the moles and molar mass of zinc, find the mass of zinc.

If you get stuck, post your working
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5 months ago
#6
Can someone help me on this question please:
Mass of zinc needed to make 1.62 g zinc oxide when zinc is heated in the presence of oxygen (2Zn + O2 → 2ZnO) is
find the number of moles of zinc oxide
use the equation to find the equivalent number of moles of zinc
convert moles of zinc into mass
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#7
(Original post by epicnm)
Use the molar mass and mass of zinc oxide to find the number of moles in Zinc oxide
Compare the ratios of zinc oxide to zinc
In this case 1:1 so the moles are the same
Using the moles and molar mass of zinc, find the mass of zinc.

If you get stuck, post your working
so you don't do anything about the fact it says 'in the presence of oxygen'
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5 months ago
#8
so you don't do anything about the fact it says 'in the presence of oxygen'
The zinc is heated in the presence of oxygen, which means it reacts with the oxygen in the atmosphere to form zinc oxide. So it just means the zinc is reacting with oxygen.
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