Chemistry, 15.10.2019 17:30 yasmin7813

Which substance would you most likely need to cool to the lowest temperature before it condenses?
a. ammonia (nh3), a polar covalent compound

b. ethane (c2h6), a nonpolar covalent compound

c. potassium bromide (kbr), an ionic compound

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Schwarzschild Radius here.

So,

The real questions is "Which compound has the lowest boiling point?" The answer would be the compound with the lowest intermolecular attractions.

Typically, the hierarchy of intermolecular attractions is as follows:

Ionic >> polar covalent > nonpolar covalent

Ionic compounds typically have very high boiling points, because melting them involves inputting enough energy to rip apart the positive and negative ions. Sodium chloride, for example, has a boiling point of 1413°C. So potassium bromide would probably have the highest boiling point.

Polar covalent compounds typically have boiling points closer to room temperature. The most familiar polar covalent compound is water, with a boiling point of 100°C. Ammonia is actually similar to water in that its primary intermolecular attraction is hydrogen bonding.

Nonpolar covalent compounds typically have the lowest boiling points. Small alkanes/alkenes/alkynes have very low boiling points. Their main intermolecular attraction is London dispersion forces, which are directly proportional to molecular mass, and thus are very weak in molecules such as methane, ethane/ethene, propane/propene, etc. Thus, we can expect ethane to have the lowest boiling point.

Hope this helps!

Answer from: Quest

a basic solution is an aqueous solution containing more oh-ions than h+ions. in other words, it is an aqueous solution with a ph greater than 7. basic solutions contain ions, conduct electricity, turn red litmus paper blue, and feel slippery to the touch.

explanation:

Answer from: Quest

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

$\delta h=e_p-e_r$

$\delta h$ = enthaply

$e_p$ = energy of products

$e_r$ = energy of reactants

as $e_p< e_r$ , thus $\delta h$ comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

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Maleic acid is a carbon-hydrogen-oxygen compound used in dyeing and finishing fabrics and as a preservative of oils and fats.* in a combustion analysis, a 1.054-g sample of maleic acid yields 1.599 g of co_2 and 0.327 g of h2o.* when 0.609 g of maleic acid is dissolved in 25.00 g of glacial acetic acid, the freezing point drops by 0.82 c. maleic acid does not ionize in glacial acetic acid, which has a freezing-point depression constant of k_{\rm f}=3.90~^\circ {\rm c}/m.* in a titration experiment, a 0.4250- g sample of maleic acid is dissolved in water and requires 34.03 ml of 0.2152 m koh for its complete neutralization.* the ph of 0.215 g of maleic acid in 50.00 ml of aqueous solution is found to be 1.80.part adetermine the empirical formula for maleic acid. enter the atoms in order ofc, h, and o.part bdetermine the molecular formula for maleic acid. enter the atoms in order of c,h, and o.express your answer as a chemical formula.part cbased on the titration data, how many ionizable h atoms are in each molecule of maleic acid, c4h4o4? express your answer as an integer.i got the part a and b which is cho and c4h4o4 respectively, can anyone me for part c? the below is what i have so far from other qa'sfinding the empirical formula for maleic acid, needs this info"a combustion analysis a 1.054-g sample of maleic acid yields 1.599g of and 0.327g of ".the rest of your data is used to find molar mass, molecular formula, equivalent mass, # of h+ ions / molecule & katypically this should be: a 1.054-g sample of maleic acid yields 1.599g of co2 and 0.327g of h2osofind mass using molar masses1.599g of co2 @ (12.01 g carbon) / (44.01 g co2) = 0.436 grams of carbon0.327g of h2o @ (2.016 g hydrogen) / (18.01 g/mol h2o) = 0.037 grams of hydrogen1.054-g sample - 0.436 grams of carbon - 0.037 grams of hydrogen = 0.581 grams of oxygennow use molar masses to find moles0.436 grams of carbon @ 12.01 g/mol = 0.0363 mol c0.037 grams of hydrogen @ 1.008 g/mol = 0.0367 mol h0.581 grams of oxygen @ 16.00 g/mol = 0.0363 mol oyour empirical formula ischo and molecular is c4h4o4

Answers: 3

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Which substance would you most likely need to cool to the lowest temperature before it condenses?

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