 # Calem Curreen

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Physics

Asked by Kaymie · 2 years ago

How many electrons are removed from 2.02^10 to the power of minus 2 of Ne atoms to form Ne 1+ ions?? A detailed explanation will be very much appreciated!?

Assuming the question is missing the word ‘moles’ before ‘of’, you are being asked to recognise that for every Ne atom ionised to form Ne+ you are removing one electron. So 2.02 x 10^{-2} moles of Ne atoms require the removal of 2.02 x 10^{-2} moles of electrons to form 2.02 x 10^{-2} moles of Ne+ ions.

Chemistry

Asked by Bally · 2 years ago

0.64 grams of copper when heated in air form 0.80grams of copper oxide. What is the simplest formula of copper oxide?

The moles of Cu reacted in excess oxygen is: mass / atomic mass of Cu = 0.01 mol. The moles of copper oxide formed will be some fraction (half, third, quarter, etc.) of 0.01 mol, depending on how the formula balances. Let’s call the big stochiometric coefficient in front of copper oxide ‘n’. The moles of copper oxide is therefore 0.01 x n, and the formula mass of copper oxide must be: mass / mol... more 