Determine the mass of oxygen in a 9.9-g sample of Al2(SO4)3. Express your answer to two significant figures and include the appropriate units HÅ m(0) = Value Units ?

Solid ammonium chloride,NH4Cl, is formed by the reaction of gaseous ammonia,NH3, and hydrogen chloride, HCl. NH3(g)+HCl(g)⟶NH4Cl(s)  A 6.14 g sample of NH3 gas and a 6.14 sample of HCl gas are mixed in a 1.00 L flask a 25⁢ ∘C. Identify the limiting reagent. How many grams of NH4Cl will be formed by this reaction?  What is the pressure in atmospheres of the gas remaining in the flask? Ignore the volume of solid NH4Cl produced by the reaction.

6 CO2 (g) + 6 H20 (- CH1206 (s) + 6 O2 (g) How many grams of carbon dioxide would be required to produce 42.5 g C,H1206? In the 'Answer' box, express your numerical answer to the nearest ±0.1

Acid rain is caused in part by burning coal that contains sulfur impurities. The sulfur is converted first to SO2, which reacts with oxygen and atmospheric moisture to produce sulfuric acid, H2SO4. If a particular coal contains 1.90% sulfur (by mass), calculate the mass of sulfuric acid produced by burning a metric ton (1000 kg) of the coal.

A student sets up the following equation to solve a problem in solution stoichiometry. (The ? stands for a number the student is going to calculate.) Enter the units of the student's answer. mol (4.6(0472) (26.16 )= mol 0x10 ロ･ロ X 3 0|0 5

7 Sodium azide (Na,N) decomposes on heating to form sodium and nitrogen gas. 2Na,N → 6Na + N2 1.35g of sodium nitride were heated. a Calculate the mass of sodium formed on complete decomposition of the sodium nitride. Give your answer to 3 significant figures. (AO2) 3 marks b Calculate the volume of nitrogen gas (in cm³) produced on complete decomposition of 1.35 g of sodium nitride at 320K and 110kPa. The gas constant R = 8.31JK-'mol-'. Give your answer to 3 significant figures. (AO2) 3 marks

n3 of 14 Phosphorus reacts with oxygen to form diphosphorus pentoxide, P,0,. 4 P(s) + 5 0,(g) - → 2 P,0,(s) How many grams of P,O, are formed when 3.83 g of phosphorus reacts with excess oxygen? Show the unit analysis used for the calculation by placing the correct components into the unit-factor slots. 言 性 料 E 3.83 g P × = g P,O, 自 自 5. 2 .... 雪 Answer Bank 32.00 g O2 141.94 g P2O5 4 mol P 30.97 g P 1 mol P205 2 mol P205 1 mol O, 5 mol O2 1 mol P , , AT- rs .** r a s W, e | | contact us | help about us privacy policy terms of use careers MacBook Air

O 00 5 Phosphorus reacts with oxygen to form diphosphorus pentoxide, P,O,. 4 P(s) + 50,(g) –→ 2 P,0,(s) How many grams of P,O, are formed when 6.71 g of phosphorus reacts with excess oxygen? Show the unit analysis used for the calculation by placing the correct components into the unit-factor slots. 6.71 g P x = g P,O, Answer Bank 32.00 g 0, 4 mol P I mol P 30.97 g P 2 mol P,O, I mol P,0, I mol O, 141.94 g P,0, 5 mol 0, grams of P,0,: g P,0,

When solutions of silver nitrate and sodium chloride are mixed, silver chloride precipitates out of solution according to the equation AGNO3 (aq) + NaCI(aq)→AgCl(s) + NaNO3(aq) Part A What mass of silver chloride can be produced from 1.69 L of a 0.214 solution of silver nitrate? Express your answer with the appropriate units. • View Available Hint(s) ? mass of AgCl = Value Units Submit Part B The reaction described in Part A required 3.48 L of sodium chloride. What is the concentration of this sodium chloride solution? Express your answer with the appropriate units. • View Available Hint(s) HA ? Value Units Submit

An amount (in grams) of nitrogen gas is reacted with excess hydrogen, according to the balanced reaction shown below.  If 104 g of NH3 is recovered, giving a percent yield of 42%, what was the mass of the nitrogen (in grams) that reacted?   N2 (g) + 3 H2 (g) -->  2 NH3 (g)   Report your answer as an integer, that is as a number with zero decimal places, and with no units.  Do NOT use scientific notation.