What mass of oxygen will exactly react with 6.0 g of magnesium?

2Mg + O2 ---> 2MgO

atomic mass of Oxygen is 16
atomic mass of Magnesium is 24

1 Answer
anor277
Jan 30, 2018

Approx....#4*g....#

Explanation:

We write the stoichiometric equation....

#Mg(s) + 1/2O_2(g) rarr MgO(g)#

#"Moles of metal"=(6.0*g)/(24.3*g*mol^-1)=0.247*mol#..

And HALF an equiv of dioxygen gas reacts....i.e.

#1/2xx0.247*molxx32*g*mol^-1=??*g#

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