Express the mass to three significant digits with the appropriate units. 10.4 g Submit Previous Answers v Correct For a measured enthalpy change of 82.2 kJ, the number of moles of methane gas formed is found by performing the following calculation: 2 mol CH, 82.2 kJ × = 0.650 mol CH, 252.8 kJ The ratio uses the coefficient taken from the balanced chemical equation. Then, moles are converted to mass by using the corresponding molar mass of methane (16.0- Part D How many kilojoules of heat are released when 38.2 g of CH4(g) reacts completely with O2(g) to form CH3OH(g) at constant pressure? Express heat to three significant digits with the appropriate units. Value Units Submit Request Answer

Express the mass to three significant digits with the appropriate units. 10.4 g Submit Previous Answers v Correct For a measured enthalpy change of 82.2 kJ, the number of moles of methane gas formed is found by performing the following calculation: 2 mol CH, 82.2 kJ × = 0.650 mol CH, 252.8 kJ The ratio uses the coefficient taken from the balanced chemical equation. Then, moles are converted to mass by using the corresponding molar mass of methane (16.0- Part D How many kilojoules of heat are released when 38.2 g of CH4(g) reacts completely with O2(g) to form CH3OH(g) at constant pressure? Express heat to three significant digits with the appropriate units. Value Units Submit Request Answer

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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3. Determine the enthalpy change (AH₂) for the final reaction below. a. CO(g) + ½ O₂(g) → CO₂(g) AH, -67.6 kcal b. N₂(g) + O₂(g) →→→ 2NO(g) AH₂ = 43.2 kcal c. CO(g) + NO(g) →→→ CO₂(g) + ¹½ N₂(g) AH₂ = ?
The enthalpy for combustion for ethanol is -1370.7 kJ/mole and occurs via the following balance chemical reaction. C2H6O (l) + 3 O2 (g) --> 2 CO2 (g) + 3 H2O (g) If 0.461 grams of ethanol are combusted in the presence of 1.28 g of O2, answer the following. a. How many grams of CO2 could be produced? b. How much heat is released? c. What is the change in internal energy (DU)?
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?
The enthalpy change of neutralization is -55.8 kJ/mol for a strong base strong acid reaction generating water. If you have 0.5 mol of H2SO4 and 0.5 mol of NaOH, what is the balanced chemical reaction, and calculate the limiting reagent for the reaction?
The human body burns glucose (C6H₁2O6) for energy according to this chemical reaction: C6H12O6 +60₂-6CO₂ + 6H₂O The products of the reaction are carbon dioxide (CO₂) and water (H₂O). Interestingly, all of the carbon dioxide and much of the water exits the body through the lungs: on every breath, the average person exhales 500. mL of air, which is typically enriched to 4% CO₂ and 5% water vapor by volume. In short, when a person loses weight by dieting, the weight that is lost actually departs his body as a gas, every time he exhales. Each kilogram of body fat lost requires exhaling about 2.9 kg of carbon dioxide. Calculate how many breaths it takes an average person to "exhale" 1.00 kg of fat. Round your answer to the nearest thousand. You'll need to know that the density of CO₂ is 2.0 kg/m³. 0 ☐ ☐x10 X
What is the sum of coefficients from the following reaction (both products and reactants)? X.3H2O + Heat ---> X can be any element.
Consider the reaction. heat 2 Al(s) + Fe,0,(s) Al, 0,(s) + 2 Fe(1) If 10.7 kg Al reacts with an excess of Fe, O3, how many kilograms of Al,O, will be produced? mass of Al, O, produced: kg * TOOLS x10
What is the sum of coefficients from the following reaction (both products and reactants)? X.3H2O + Heat ---> X can be any element.
Consider the reaction. heat 2 Al(s) + Fe,O,(s) → Al, O, (s) + 2 Fe(1) If 23.1 kg Al reacts with an excess of Fe, O,, how many kilograms of Al, O, will be produced? mass of Al, 0, produced: kg
The following unbalanced equation illustrates the overall reaction by which the body utilizes glucose to produce energy: C6H12O6(s) + O2(g) → CO2(g) + H2O(l) What is the conversion factor that allows for the calculation of moles of carbon dioxide based on moles of glucose?
esc Phosphoric acid, which is commonly used as rust inhibitor, food additive and etching agent for dental and orthopedic use, can be synthesized using a two-step thermal process. In the first step, phosphorus and oxygen react to form diphosphorus pentoxide: P₁(1)+50₂(g) 2 P₂O(g) In the second step, diphosphorus pentoxide and water react to form phosphoric acid: P₂O(g) + 3 H₂O(1)-2 H₂PO₂(0) 4 Write the net chemical equation for the production of phosphoric acid from phosphorus, oxygen and water. Be sure your equation is balanced. 0 Continue 56°F Clear F1 J F2 @ 2 F3 # 3 Q Search F4 $ 4 F5 % 5 F6 6 0-0 X F7 & 00 7 Ś F8 © 2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibi M OO DELL F9 prt sc F10 home F11 end 12 F12 0 Submit Assignment J olo 18 Ar insert
2. If 550 mL of water changes temperature from 25.0°C to 28.0°C during the complete combustion of propane, determine the mass of propane that is combusted using the information in this question? C3H8(g) + 502(g) · 3CO2(g) + 4H₂O(g) + 2050 kJ