• oxygen atoms exist longer

Assume that a single cylinder of an automobile engine hasa volume of 524 cm3. (a) If the cylinder is full of air at 74 °Cand 0.980 atm, how many moles of O2 are present? (Themole fraction of O2 in dry air is 0.2095.) (b) How manygrams of C8H18 could be combusted by this quantity ofO2, assuming complete combustion with formation ofCO2 and H2O?

1.. (8) СаСО:(s) → CaO(s) + CO2(g) Calculate the volume of CO2 released at 745 mmHg and 77°C, when 50 g of CaCO3 is decomposed? (Ca-40, С-12, О-16)

(b) Calculate the partial pressure of Ne 5. A 5L car tire is filled with N2 to a pressure of 4 atm at 18°C. (a) How many grams of N2 present in the tire? (b) What will be the tire pressure on a cold day when the temperature is -15°C? 6. Given that the AH for CaO, H3PO4, Ca3(PO4)2 and H2O, are, respectively, -635

(7)What is the volume of 2.75 X 10^24 molecules of nitrogen trihydride has?

6.157 Consider the Haber process: «N2(g) + 3H½(g) > 2NH3(g); AH° = -91.8 kJ 3H2(g).= %3| copied, whole 02 200-203 The density of ammonia at 25°C and 1.00 atm is 0.696 g/L. The density of nitrogen, N2, is 1.145 g/L, and the molar heat capacity is 29.12 J/(mol •°C). (a) How much heat is evolved in the production of 1.00 L of ammonia at 25°C and 1.00 atm? (b) What percentage of this heat is required to heat the nitrogen required for this reaction (0.500 L) from 25°C to 400°C, the temperature at which the Haber process is run?

The total volume of hydrogen gas needed to fill the Hinderburg was 2.00 x 108L at 1.00 atm and 25.0oC. How much energy was evolved when it burned?*hint - Use the Ideal Gas Law to obtain the moles of hydrogen gas. 2 H2(g) + O2(g) --> 2 H2O(l) ΔH = -572 kJ

11.8 g of aluminium metal is dropped into a beaker that contained hydrochloric acid.How many litres of hydrogen gas will be produced at SATP conditions?

1. One of the first families of rockets used by the American space program was the Redstonefamily of rockets. The first Redstone rockets (in the 1950s) used B10H14 (often called decaborane)as a rocket fuel that reacts violently with liquid di-oxygen to make diboron trioxide and steam.When used as a rocket fuel, scientists carefully calculated the amount necessary so that bothcomponents ran out at the same time. (Excess fuel would be excess weight for the rocket tocarry.) If the total mass of both reactants put together is 12.0  104 kg, what was the volume ofliquid di-oxygen carried by the rockets? (Liquid di-oxygen has a density of 1.141 g/mL.)

a sample of dolomitic limestone containing only CaCO3 and MgCO3 was analyzed a) when a 0.2800-gram sample of this limestone was decomposed by heating, 75.o milliliters of CO2 at 750. mm Hg and 20°C were evolved. How many grams of CO2 were produced? b) write equations for the decomposition of both carbonates described above.  c) It was also determined that the initial sample contained 0.0448-gram of calcium. What percent of the limestone by mass was CaCO3? d) How many grams of the magnesium-containing product were present in the sample in a. after it had been heated?