It is not possible to ignite diethyl ether at temperatures lower than +35 degrees Celsius.

(a) Write the chemical equation for the complete combustion of butane.  (b) Why is it not advisable to use a butane stove inside a tent?

21 Consider the combustion of in oxygen gas to produce carbon dioxide gas and water vapor. In an experiment, 0.1063 g of C₅H₈ is combusted to produce enough heat to raise the temperature of 150.0 g of water by 7.632 °C. C₅H₈ (l) + 7 O₂ (g) → 5 CO₂ (g) + 4 H₂O (g) d If 4790 J of heat were absorbed by the water, then how much heat, in J, was produced by the combustion of C₅H₈? (include the appropriate sign)

Explain step by step why each can or cannot occur.

= 14 15 16 17 18 19 20 21 22 23 24 25 26 thermometer A 52.3 g sample of quartz is put into a calorimeter (see sketch at right) that contains 100.0 g of water. The quartz sample starts off alo insulated container at 90.2 °C and the temperature of the water starts off at 24.0 °C. When the temperature of the water stops changing it's 29.6 °C. The pressure remains constant at 1 atm. water Calculate the specific heat capacity of quartz according to this experiment. Be sure your answer is rounded to 2 significant digits. sample a calorimeter J ?

21

Which of the following reactions is exothermic? C2H4(g) + O2(g) → 2C(s) + 2H2O(g) AH = 469.2 kJ O N204(g) + 57.6 kJ → 2NO2(g) C2H4(g) + 302(g) → 2CO2(g) + 2H2O(g) > AH = 1322.9 kJ PCI3(g) + Cl2(g)→ PCI5(g) + 92.5 kJ

A student dissolves 10.8 g of ammonium nitrate (NH4NO₂) in 250. g of water in a well-insulated open cup. He then observes the temperature of the water fall from 20.0 °C to 16.1 °C over the course of 8.4 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NH4NO3(s) NH(aq) + NO3(aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 2 significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy ΔΗ per mole of NH4NO3. rxn exothermic…