Part A Calculate the mass percent composition of lithium in lithium oxide. Expre

ID: 977925 • Letter: P

Question

Part A

Calculate the mass percent composition of lithium in lithium oxide. Express the mass percentage to four significant figures.

Part B

A metal (M) fors a compound with the formula MCl3.

If the compound contains 79.76 % Cl by mass, what is the identity of the metal?
Express your answer as a chemical symbol.

Part C

Without doing any calculations, arrange the elements in CuNO2 in order of decreasing mass percent composition.

Rank from highest percent to lowest. To rank items as equivalent, overlap them. N, CU, O

For Part A

Lithium oxide molar mass = 29.882 g/mol

Mass of lithium = 6.941 * 2 = 13.882

Mass of Oxygen = 16

%Lithium = 13.882 / 29.882 * 100 = 46.46 %

Part B

Mass of chlorine = 35.453 * 3 = 106.36 grams/mol

Mass of metal = 106.36 / 0.7976 - 106.36 = 27 g/mol

Metal -> Aluminum -> Al

Part C

Cu > O > N

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