There are many different hydrocarbons that are used as fossil fuels. For each of the following fuels, determine the mass (ing) of CO2 that would be produced by burning enough fuel to produce 250. kJ of heat. Place your answer to three significant
figures) in the boxes below.
In this question, assume a complete combustion reaction, and assume the standard enthapy of formation for CO2 is -393.5
kJ/mol and H2O is -241.8 kJ/mol.
Pentane, C5H12 (AHF = -146.8 kJ/mol)
Butane, C4H10 (AHF = -125.8 kJ/mol)
Octane, C8H18 (AH = -249.7 kJ/mol)
Based on your answers, which fuel contributes least to the increase in atmospheric CO2 per k) of heat produced?

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

the answer is c

tell me if wrong