How do i solve my chemistry homework?

Posted on 2014-12-11 06:44:00 in Chemistry by DYSU

Student 1 heated a sample of an unknown group 2 metal strongly in a crucible. after heating, a metal oxide was formed. the crucible and the metal were weighed before, and after heating. the results are shown as below

mass of empty crucible and lid (g) = 8.896
mass of crucible and lid with metal (g) = 10.256
mass of crucible and lid with metal oxide after heating (g) =10.817

a. write balanced chemical equation, including state symbols, for the reaction. use M to represent the unknown metal.
O2 (g) + M (s) -> MO (s)

b. calculate the moles of oxygen that reacted with the metal.
0.0350

c. how many moles of metal were present?

d. determine the molar mass of the metal and identify the metal.

how would i work out how many moles of the unknown metal were present??

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