You are working in the laboratory preparing sodium chloride. Consider the following results for three preparations of the compound:Case 1: 39.34 g Na + 60.66 g Cl2 → 100.00 g NaClCase 2: 39.34 g Na + 70.00 g Cl2 →                                                        100.00 g NaCl + 9.34 g Cl2Case 3: 50.00 g Na + 50.00 g Cl2 → 82.43 g NaCl + 17.57 g NaExplain these results in terms of the laws of conservation of mass and definite composition.

A 2.1880 g sample of a hydrate of Cu(NO3)2 was heated to drive off all of the water of hydration. The remaining solid weighed 1.6986 g. If Cu(NO3)2 X H₂O represents the formula of the hydrate, then what is the value of x? Note: The notation Cu(NO3)2 X H₂O indicates that there are x moles of H₂O for every mole of Cu(NO3)2 in the solid hydrate. Molar masses (in g mol¯¹): H, 1.008 Mg, 24.31 Ni, 58.69 N, 14.01 S, 32.07 Cu, 63.55 O, 16.00 Mn, 54.94 Hg, 200.6

Consider the following table: Substance Density (g/mL) Gold (s) 19.32 10.49 Silver (s) Lead (s) 11.34 What is the mass of 1.25 L of gold? O 2.42 x 10-2 g O 24.2 g O 64.7 g O 24.2 kg O 6.47 x 10-2 g

A hydrated sample of sodium hydrogen phosphate (Na2HPO4) was found to contain 47.05% water by mass. Determine the formula of the hydrate. Molar mass of anhydrous sodium hydrogen phosphate (Na2HPO4) = 141.96 g/mol Molar mass of water H2O = 18.015g/mol

Write the formulas of the elements that are reactants and the formulas of the compounds that are products in: Fe + 2HCI → FeCl2 + H2 Elements that are reactants: Compounds that are products:

A classic SUV features a 194 L gas tank. Assuming a molecular formula of C8H18 for gasoline and complete combustion of the gasoline with O2 to form CO2 and H2O, calculate the amount of O2 in kilograms consumed per tank of gasoline. Assume a density of 780 g/L for the gasoline.   Atomic Mass: C: 12.011 g/mol H: 1.008 g/mol O: 15.999 g/mol   Round your answer to 2 decimal places.

A mixture of 132.1 g of P and 136.5 g of O, reacts completely to form P¸O, and P,0,o: Find the masses of P,0, and P,O10 that are formed by the reaction. mass of P406: g mass of P¿010: g 4

Morphine sulfate used for severe pain relief is an opiate alkaloid isolated from the plant Papaver somniferum. In the central nervous and gastrointestinal systems, this agent has widespread effects including analgesia, anxiolysis, euphoria, sedation, respiratory depression, and gastrointestinal system smooth muscle contraction. Morphine sulfate has 34 Carbon atoms, 40 atoms of Hydrogen, 2 Nitrogen atoms, 10 Oxygen atoms, and 1 atom of Sulfur. What is the Chemical formula of this compound:

A 10.5 g sample of lithium is reacted with 18.5 g of fluorine to form lithium fluoride:Li + F2 → LiF. After the reaction is complete, what will be present?

A 1.58 mole sample of a pure unknown substance has a density of 1.87 g/cm3. If the sample occupies a volume of 188. cm3, what is the identity of the substance in the samples? Element Molar Mass Cadmium 112.411 Francium 223.02 Barium 137.327 Terbium 158.925 Molybdenum 95.95 Terbium Molybdenum Cadmium Francium Barium