Chemistry answer check
posted by Mary .
What quantity of heat is required to produce 5 mol of oxygen gas by this reaction? HgO(s) → Hg(l) + ½ O2(g), ΔH = +90.7kJ
I calculated 90.7*5, but my online homework says its wrong how do I calcuate this?

907.5 kJ

What do you have to multiply ½ O2 by to get 5 moles of O2?
1/2x=5
Solving for x
x=10, so you have to multiply O2 and everything else by 10 to get the following:
10HgO(s) → 10Hg(l) +5O2(g), ΔH = +907kJ not 907.5 kj. I apologize, a typo in my original response. 
907
Respond to this Question
Similar Questions

chemistry
I can't figure this question out for the life of me. If anyone could help me, that'd be great! Given change of heat of formation for Cu^2+ (aq)=+71.7kJ/mol and that for Zn^2+(aq)= 153.9kJ/mole; find the heat of reaction for: Zn(s) … 
chemistry
How many grams of oxygen gas are required to produce 7.46 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water? 
chemistry
How many grams of oxygen gas are required to produce 7.46 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water? 
chemistry
Mercury reacts with oxygen to produce mercury(II) oxide. Hg(l) + O2(g) → HgO(s) a. Balance the reaction equation. Include physical states. 2Hg(l) + O2(g) → 2HgO(s) b. What is the theoretical yield (in grams) of HgO if 255 … 
chemistry
Nitroglycerin is a powerful explosive, giving four different gases when detonated.2 C3H5(NO3)3 (l) → 3 N2 (g) + 1/2 O2 (g) + 6 CO2 (g) + 5 H2O (g)Given that the enthalpy of formation of nitroglycerin, ΔHf°, is −364 … 
Chemistry
Given the following hypothetical equations, 2A + B → 3C + 2D ΔH = 46.7kJ C → B ΔH = 13.1kJ 2E → B ΔH = 84.5kJ, what is the enthalpy change (kJ) for the following reaction? 
Chemistry
Can you check my calculations, please? It's for a lab we did in order to find the the enthalpy of formation of NH4Cl(s). My final answer was 299.4 kJ, while the theoretical, or actual, value is 314.4 kJ. It was the closest value 
Chem
Calculate the work (in kJ) when 1.80 moles of methane react with excess oxygen at 389 K: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) I got 11661.26 Calculate the change in entropy (in J/K) when 70.1 g of nitrogen gas is heated at a constant … 
Can someone please check my answer for chemistry
Compelete the following table for an ideal gas. P= 7.74*10^3 Pa V= 10.3 mL N= ? 
Chemistry
Enthalpy Change Given the following reactions: S(s) + O2(g) → SO2(g) ΔH = 297 kJ/mol SO2(g) + ½ O2(g) → SO3(g) ΔH = 141 kJ/mol Calculate the ΔH for the reaction: S(s) + 3/2O2(g) → SO3(g)