company’s energy cost

CH, (g) 20, (g) → CO, (g) + 2 H,O (g) + Exothermic or endothermic

Given the following equation: 2H3PO4 + 3Mg(OH)2  → 6 H2O + Ca3(PO4)2 + 450.8 kJ If 300 mL of 0.75 mols/L phosphoric acid solution, H3PO4, is mixed with 25.0 g of magnesium hydroxide, Mg(OH)2,  predict the amount of energy released     Note: the sign (-/+) is not relevant to the question.                    Your answer should follow the format: a) mols of H3PO4 b) maximum energy released if all of the H3PO4 reacts (with units) c) mols of Mg(OH)2 d) maximum energy released if all of the Mg(OH)2 reacts (with units) e) based on your answer to (b) and (d), how much energy will be released by this reaction based on the quantities of reactants indicated.

During an experiment a student mixed two chemicals together and noted that the beaker felt warm to the touch after the reaction was complete. In the experiment, the chemicals would be classified as the From this observation, the student concluded that the reaction was A. Which of the following energy pathway diagrams represents the chemical reaction from the student's experiment? Ep (kJ) Select one: OA OB 150 125 100 + and the beaker would be classified as the Reaction Coordinate and that the resulting change in enthalpy (AH) would have a B. 125 E 100 Reaction Coordinate Ep (kJ) 150 ◆ value.

The flame in a torch used to cut metal is produced by burning acetylene (C2H2)(26.04 g/mol) in pure oxygen. Assuming the combustion of 1 mole of acetylene releases 1251 kJ of heat, what mass of acetylene is needed to cut through a piece of steel if the process requires 22.5  × 104 kJ of heat?                                            2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g) ΔH = –2502 kJ

It took 16641664 J to raise the temperature of a sample of water from 12.512.5 °C to 34.534.5 °C. Convert 16641664 J to calories.

If you had a metal cylinder of each metal listed below, all with the same mass, which metal would raise the temperature of 40.0 mL of water the most after being boiled for 10 minutes? Note: use Table 5.1 in your manual as a reference. Zinc Bronze Copper Lead Nickel

A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 6.30 kg of water at 21.7 °C. During the reaction 143. kJ of heat flows out of the bath and into the flask. Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions iS 4.18 J·g¯¹·K¯¹. Round your answer to 3 significant digits.