Do Question Number 3 SHoW YOUR WORK VERY, VERY CLEARL.Y 1. A mixture of 3.5 g of

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Do Question Number 3

SHoW YOUR WORK VERY, VERY CLEARL.Y 1. A mixture of 3.5 g of hydrogen and 260 g of oxygen is made to react to form water a) Which reactant is limiting? b) Which reactant will be left over? ) How many reactant will be left over? d) How many grams of water will be grams of the produced? A large neon sign is to be filled with a mixture of gases, including 6348 g of neon. What number of mole is this? 2. A metal, M, forms an oxide having the simplest formula M,Os. This oxide contains 52.9 % of metal by mass. a) Calculate the atomic weight of the metal; b) Identify the metal. 3, 4. From a 45.0 g sample of an iron ore containing Fe,O 1.5 g Fe is obtained by the following reaction: Fe,04 + 2C 3Fe + 2CO2. What is the percent if Fe,0? 5. Balance the following Equations: a) ZnCl: + NaOH Zn(OH);+ NaCl c) Al + HCl AICb + H: 6. A 1.3s-g sample of a substance containing carbon, hydrogen, nitrogen and oxygen was burned to produce 0.810 g H:0 and 1.32 g CO. In a separate reaction, all the nitrogen in 0.735 g of the substance was converted to 0.284 g NH. Determine the empirical formula of the substance. If the molar mass of this compound is 65.06g, what is the molecular formula? Oxyacetylene torches used for welding reach a temperature near 2000·The reaction involved is the combustion of acetylene, C2H2 7, 2C2H2(g) + 5O2(g) 4C02(g)+ 2H,01) Starting with175 g of both acetylene and oxygen, what is the theoretical yield, in grams of carbon dioxide? If S2.5 L of carbon dioxide (density - 1.80 gL are produced, what if the percent yield?

Explanation / Answer

M2O3 contains 52.9% of metal

mass percentage of metal = 52.9%

mass percentage of oxygen = 100-52.9   = 47.1%

3 moles of oxygen with 2 moles of M

3*16 g of oxygen with 2 moles of M

47.1g of xygen with = 2*47.1/3*16   = 1.96 moles of M

atomic mass of metal   = weight of metal/no of moles of metal

                                       = 52.9/1.96   = 27g/mole

That metal is aluminum ( Al)

formula of metallic oxide is Al2O3

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