A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a 1 atm pressure piston cylinder large insulated water bath. (See sketch at right.) water bath From previous experiments, this chemical reaction is known to release 255. kJ of energy. gases The temperature of the water bath is monitored, and it is determined from this data that 324. kJ of heat flows into the system during the reaction. exothermic Is the reaction exothermic or endothermic? endothermic up ? Does the temperature of the water bath go up or down? down neither in Does the niston nmove in or out? out

A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a 1 atm pressure piston cylinder large insulated water bath. (See sketch at right.) water bath From previous experiments, this chemical reaction is known to release 255. kJ of energy. gases The temperature of the water bath is monitored, and it is determined from this data that 324. kJ of heat flows into the system during the reaction. exothermic Is the reaction exothermic or endothermic? endothermic up ? Does the temperature of the water bath go up or down? down neither in Does the niston nmove in or out? out

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also 1 atm pressure piston cylinder submerged in a large insulated water bath. (See sketch at right.) water bath From previous experiments, this chemical reaction is known to release 159. kJ of gases energy. The temperature of the water bath is monitored, and it is determined from this data that 277. kJ of heat flows out of the system during the reaction. exothermic Is the reaction exothermic or endothermic? x10 endothermic up Does the temperature of the water bath go up or down? down neither in Does the piston move in or out? out neither does work Does the gas mixture do work, or is work done on it? work is done on it neither How much work is done on (or by) the gas mixture? Be sure your answer has the correct number of significant digits.
??? Write the balanced equation with the heat component !
A prototype sports ball for a new game is precisely inflated to a pressure of 7.3 psi at 25 degrees C. The ball is spherical with an inner bladder diameter of 22.8 cm. It is filled with air (Mw=28.97 g/mol). Not Avogadro’s number is 6.022 x 10^23 atom/mol. A. Calculate the number of moles of air in the ball at the specified temperature and pressure. Consider the air in the ball to follow the ideal gas law. PV=nRT Where P is the absolute pressure of the air in atm, V is the volume of the ball, T is the absolute temperature in K, and R is the ideal gas constant. B. How many oxygen atoms compose the air in the ball? Assume that the mole fraction of N2 in the air is 0.79 and the remainder of the air is 02(oxygen).
A hot air balloon has a volume of one million liters. If the temperature of the outside air is 20°C and that of the hot air inside the balloon is 80°C, what is the maximum load (in kg) that the balloon can carry at 1.0 atm? Assume Mair = 28.97 g/mol.
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A 10g sample of CaCO, (s) was heated to produce CO, gas: CaCO, (s) heat a. Calculate mol amount of CO, produced (Hint: use stoichiometry) CaO(s) + CO,(g) b. Generated CO2 gas occupies 29L at 2.5atm and 127°C. Calculate the volume of gas at STP. C. Calculate molar volume of CO, at STP
Q:15 A sealed metal canister at 749 torr pressure is heated from -25.0 °C to 100 °C. What is the final pressure in atm? (show work)
7. When detern ing the mass of a liquid, ras in a hurry and did not allow enough time for the temperature of the flask to reach the temperature of the boiling water bath. The student recorded the temperature of the gas as 100.0°C when it was only 80.0°C, Is the molar mass calculated by the student higher or lower than the accepted molar mass, or does this error have no effect on the calculated result? Briefly explain your answer # 2/HB Office DEPOTS b) If the student assumed the volume of the flask was 125 mL (as marked by the side of the flask) rather than measuring the volume experimentally, would the unknown's calculated molar mass be too high, too low, or unaffected? Explain. # 2/HB 4
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) From previous experiments, this chemical reaction is known to release 293. kl of energy. The position of the piston is monitored, and it is determined from this data that the system does 274, kJ of work on the piston during the reaction. Is the reaction exothermic ar endothermic? exothermic endothermic up Does the temperature of the water bath go up or down? down Does the piston move in or out? Does heat flow into or out of the gas mixture? lala heither neither neither Tam prese gases pon rylinde bath Som Au ement.
The preparation of NO2(g) from N2(g) and O2(g) is an endothermic reaction: N2(g) + O2(g) -> NO2(g) (unbalanced) The enthalpy change of reaction for the balanced equation (with lowest whole-number coefficients) is ∆H = 67.7 kJ. If 250 mL of N2(g) at 100oC and 3.50 atm and 450 mL of O2(g) at 100oC and 3.50 atm are mixed, what amount of heat is necessary to synthesize NO2(g)?
thermometer A 53.6 g sample of iron, which has a specific heat capacity of 0.449 J.g .°c ', is put into a calorimeter (see sketch at right) that contains 200.0 g of water. The temperature of the water starts off at 23.0 °C. When the temperature of the water stops changing insulated container it's 24.9 °C, The pressure remains constant at 1 atm. water Calculate the initial temperature of the iron sample. Be sure your answer is rounded to the correct number of significant digits. sample a calorimeter ?
1. The formation of gaseous phosphorus trichloride is shown below: P4 (g) + 6 Cl2 (g) → 4 PCl3 (g) ΔH = -1207 kJ/mol If 4.30 kJ of heat are released as the formation reaction above proceeds, how many milliliters of gaseous phosphorus trichloride, measured at 35°C and 712 torr, will be produced?