"Heater meals" are precooked meals that come with a water-activated heating mechanism.  One way to heat a meal is to pour water on magnesium: Mg(s) + 2 H2O(l) → Mg(OH)2(s) + H2(g) This reaction releases 352.88 kJ as written above. Assuming magnesium is the limiting reactant, how many kilojoules of energy will be released if one starts with 2.50 g Mg?  Don't include units in the box with your answer.

MISSED THIS? Watch KCV 9.6, IWE 9.7; Read Section 9.6. You can click on the Review link to access the section in your eText. Titanium reacts with iodine to form titanium(III) iodide, emitting heat, via the following reaction: 2Ti(s) +31₂(g)→2Til3 (s), AHxn = -839 kJ Part A Determine the mass of titanium that reacts if 1.60×10³ kJ of heat is emitted by the reaction. Express your answer to three significant figures and include the appropriate units. µÅ m(Ti) = Submit Part B Value X Incorrect; Try Again; 2 attempts remaining m(l₂)= Submit Previous Answers Request Answer Determine the mass of iodine that reacts if 1.60×10³ kJ of heat is emitted by the reaction. Express your answer to three significant figures and include the appropriate units. Units 0 O µÂ Value Units Previous Answers Request Answer ? X Incorrect; Try Again; 2 attempts remaining ?

When 40 mL of 1.0 M HCl was mixed with 50 mL of 1.5 M NaOH in a coffee cup calorimeter, the temperature of the solution rose from 24.8 C to 41.5 C. Determine the heat of the reaction. Is the reaction endothermic or exothermic? Explain.

How much energy is required to decompose 1970 g of PCl3, according to the reaction below?    4 PCl3(g) → P4(s) + 6 Cl2(g)                                             ΔH°RXN = +1207 kJ