The standard molar heat of formation of water vapor (steam) is -242 kJ/mol. What amount of energy, in kilojoules, is produced when 1.50*108 liters of hydrogen gas at STP are combusted with excess of oxygen.   (a)  1.50x108                   (b)    1.62x10-9                             (c)      1.62x109                       (d)      8.10x108 (e)  None of those. If so, what is your answer?

6. Use the following balanced equation to answer the questions. 2 Al(s) + 6 HCl(g) -> 3 H2(g) +2 AlCl3(aq) rxn (a) What is AH (in kJ/mol rxn) if 2.56 g of Al reacts with excess HCl, producing 159 kJ of heat? (b) What mass of H2 is produced when 105 kJ of heat is released? (c) What is the heat change when 7.00 g of AlCl3 is formed?

1. When 500. mL of acetylene, CaHa, combusts in air at standard temperature and pressure, determine how many kilocalories of heat are generated?

If 87 J of heat are added to a balloon, causing it to expand from 1.0 L to 1.4 L under 0.97 atm of pressure, what is the change in energy of the balloon (in joules)?

Your lab partner accidentally mixed some sodium chloride with your sample of Epsom salts (MgSO₄･7H₂O). You want to make a standard solution of magnesium ion, and this is the only sample of a magnesium salt you have. To determine the amount of magnesium salt in the mixture, you heat 100.00 g to drive off the water of hydration and find that the anhydrous mixture has a mass of 57.75 g. How many grams of the original salt mixture must you add to 1.000 L of water to make a 0.100 M solution of Mg²⁺ ion?

If it takes 41.72 joules of heat for a piece of gold weighing 18.69 grams from 10.0oC to 27.0oC, what is the specific heat of the gold?

The reaction that produces the water gas mixture, described in Question 6.99, is C(s) + H₂O(g) → CO(g) + H₂(g) This reaction requires an input of 131 kJ of heat for every mole of carbon that reacts. (a) Is this reaction endothermic or exothermic? (b) What is the energy change for this reaction in units of kJ/mol of carbon?

Part A)   The standard molar heat of formation of water vapor (steam) is -242 kJ/mol. What amount of energy, in kilojoules, is produced when 1.50*108 liters of hydrogen gas at STP are combusted with excess of oxygen.   (a)  1.50x108                   (b)    1.62x10-9                             (c)      1.62x109                       (d)      8.10x108 (e)  None of those. If so, what is your answer?     Part B)  In a reaction between nickel (II) nitrate and sodium sulfide in aqueous solution, spectator ions are: (a)    sodium & sulfide (b)    nickel & nitrate (c)    sodium & nitrate (d)    nitrate & sulfide (e)    There are no spectator ions     Part C)   Carbon dioxide diffuses through a porous barrier at a rate of 0.200 mL/min. If the unknown gas diffuses through the same barrier and at the same conditions at a rate of 0.331 mL/min, what gas out of the following it may be? (a)  Ar               (b)    H2              (c)    NO              (d)     CH4…

Question 12 According to the first law of thermodynamics: (a) the energy of the universe is constant (b) A E = q + w (c) internal energy is a state function (d) energy is conserved during any chemical reaction (e) both (a) and (d) are correct (a) O b) toi

Suppose your body was able to use the chemical energy in gasoline. How far could you pedal a bicycle at 15 km/hr on the energy in 2.2 gal of gas? ( 1 gal of gas has a mass of 3.2 kg.).