Question

what weight of oxygen will react with 40g of Ca?

Answer 1

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Answer 2

$\huge{\texbf\red{ANSWER}}}$

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First of all find out moles of Calcium

Moles =mass/molar mass

Molar mass of Calcium is 40g/mol

Moles =40/40

Moles of calcium = 1 mol

Now

Balanced equation is

Ca + 1/2 O --------> CaO

it means one mole Ca reacts with 1/2mole of Oxygen

So now we havebto find out mass of oxygen

Moles of oxygen that reacts with calcium = mass / molar mass

Mass of oxygen that reacts with calcium = Moles × molar mass

Mass of oxygen that reacts with calcium = 1/2 × 16

Mass of oxygen that reacts with calcium =8g

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