Answer: C. ethanol
The enthalpy of combustion is the amount of heat produced when one mole of ethanol undergoes complete combustion at 25 ° C and 1 atmosphere pressure, yielding products also at 25 ° C and 1 atm.
<u>The enthalpy of combustion of the unknown compound is</u>
ΔH = - 320 kJ / 0.25 mol = - 1280 kJ / mol
<u>To choose a probable compound according to this combustion enthalpy, we must evaluate the deviation in relation to the values reported in the literature for the three probable compounds</u> (methane, ethylene and ethanol). The deviation (e%) will be calculated according to the following equation,
e% = ( | ΔHx - ΔH | / ΔHx ) x 100%
where ΔHx is the enthalpy of combustion of the probable compound.
The following table shows the combustion enthalpies of the probable compounds and their deviation in relation to the enthalpy of ΔH = - 1280 kJ / mol
Compound Enthalpy of combustion (kJ/mol) Deviation
Methane - 890.7 43.8%
Ehylene -1411.2 9.3%
Ethanol -1368.6 6.5%
According to the previous table, we can say that the most probable compound is ethanol, since it has the smallest deviation in relation to the experimental enthalpy value of combustion.
Explanation:
temperature changes affect seawater density as water cools its density increases. As water cools H2O molecules pack more closely together because the molecules are vibrating less at low temperatures and take up less volume. The same number of water molecules in smaller volume results higher density
The answer is 5.8x10^-10. I did the math and checked other sources as well.
The simplest molar ratio in which lithium reacts with nitrogen is 6 moles of lithium to 1 mol of nitrogen.
What is molar ratio?
A molar ratio examines the ratio that exist between two chemical compounds showing the amounts in moles of the compounds involved in a chemical reaction.
Molar ratio = amount of a constituent in moles ÷ total amount of all constituents in a mixture in moles
Given:
Mass of lithium (Li) = 4.2 g
Mass of nitrogen (N2) = 2.8 g
Total amount of mass = 7g
Moles = molecular weight ÷ mass of water
Moles of lithium (Li) = 4.2 ÷ 7 = 0.60 mol
Moles of nitrogen (N₂) = 2.8 ÷ 7 = 0.10 mol
Therefore, ratio Li : N₂ = 0.60 : 0.10 = 6 : 1
6 Li + N₂
The balanced equation between lithium and nitrogen, to form lithium nitride = 6 Li + N₂ → 2 Li₃N₆L i + N₂ → 2Li₃N
In summary, the simplest molar ratio in which lithium reacts with nitrogen is 6:1
Learn more about molar ratio here: brainly.com/question/14677248
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