Consider this reaction: 3Ca(s) + 2H3PO4(aq) → Ca3(PO4)2(s) +3H2(g)
At STP, how many moles of Ca are required to produce 18.0 liters of H2 ?
0.164 moles
0.804 moles
6.00 moles
0.361 moles

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Gail is making costumes for a school play. each rabbit costume needs one and one half yards of white fur fabric, a yard of blue striped fabric, and a quarter of a yard of pink felt for the ears. g? ail needs to make eight rabbit man yards will she need, for the white fur fabric, blue striped fabric, and pink felt?

How do you solving the solution of each system using elimination?