CO(NH2)2(aq) + H201) → CO2(9) + 2NH3(9) If 1 mole of urea is used for the reaction, what is the standard entropy change in J/K?

A)   An iron nail with a mass of 12 gg absorbs 15 J of heat. If the nail was initially at 30 ∘C, what is its final temperature? Express your answer using two significant figures. B) When 47.1 J of heat is added to 13.8 g of a liquid, its temperature rises by 1.74 ∘C. What is the heat capacity of the liquid?

Chemical energy is released or absorbed from reactions in various forms. The most easily measurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: ΔΗn = ΣηΔΗ; (products) – Σπ.ΔΗ (reactants) where n represents the stoichiometric coefficients. Part A Calculate the standard enthalpy change for the reaction Use the following data: ΔΗ; Substance (kJ/mol) A B C D ΔΗ; = -237 -385 205 -515 Submit Express your answer to three significant figures and include the appropriate units. ► View Available Hint(s) μА Value Previous Answers 2A + B2C + 2D Review | Constants I Periodic Table Units ?

Consider these reactions, where M represents a generic metal. 2 M(s) + 6 HCI(aq)→ 2 MCl,(aq) + 3 H, (g) AĦ1 = -918.0 kJ 1. HCI(g) → HCI(aq) AH = -74.8 kJ H2(g) + Cl,(g) → 2 HCI(g) AH3 = -1845.0 kJ 3. MCI3(s) –→ MCl,(aq) AHA -380.0 kJ 4. Use the given information to determine the enthalpy of the reaction 2 M(s) + 3 Cl,(g) → 2 MCI,(s) 2.

Sodium oxalate reacts with calcium chloride.  What is the sum of the coefficients for the reactants and products?   8 9 5 7 6

6) A block of rhenium metal (specific heat =0.0329 cal/ gC) is heated to 88.2C and then dropped into 100.0 g of water initially at 26.4 C. The final temperature of the mixture is 32.4C. What was the mass of the block of rhenium?

Carbohydrates serve as a vital source of chemical energy to the human body. Carbohydrates are broken down into smaller units of glucose, among other sugars, providing energy to various muscles and organs, including the brain. On average, for every 9.00 g of carbohydrates consumed, the body will store 153 kJ of energy. Convert this energy value to kilocalories (kcal). 153 kJ = kcal

Alexia determined the mass of her empty Styrofoam cup calorimeter was 1.0698 g. She then added distilled water to the cup and weighed it again. The combined mass of the cup + water was 33.2191 g. What is the mass of water, in g, in Alexia's cup?

139 kJ to Calories

Specific heat is the heat required to raise the temperature of 1 g of a substance by 1 °C. Based on this definition, what is the equation to calculate specific heat? Select one: heat O specific heat = %3D (mass x temperature change) temperature change specific heat = mass (heat x tempetature change) specific heat = mass temperature change O specific heat = (mass x heat)