Why is the melting point of $CO_2$ higher than $CH_3OH$? Wouldn't the melting point of methanol be greater because of the hydrogen bond?

Md Ariful Islam

0 like 0 dislike
1 views
Share with your friends

1 Answers

Md Ariful Islam

Call

The normal melting point of methanol is $-97.6$ $""^@C$.

But here, clearly, we compare apples and oranges, by comparing a melting point, a transition from solid to liquid, to a sublimation point, a transition from solid to gas. On the other hand, the normal boiling point of methanol $+64.7$ $""^@C$, and this indicates some considerable degree of intermolecular interaction.

The GREATER involatility of methanol may be attributed to intermolecular hydrogen bonding, which is a potent intermolecular force. The hydrogen bond may be maintained upon melting.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
How to predict which substance in each of the following pairs would have the greater intermolecular forces ? a) $CO_2$ or $OCS$; b) $SeO_2$ or $SO_2$; c) $CH_3CH_2CH_2NH_2$ or $H_2NCH_2CH_2NH_2$; d) $CH_3CH_3$ or $H_2CO$; e) $CH_3OH$ or $H2CO$.

!! LONG ANSWER !! The strength of the exhibited by a certain molecule goes hand in hand with its and with its ability to form . Right from the...

1 Answers 1 views
The fuel methanol ($CH_3OH$) is made by the reaction of carbon monoxide and hydrogen. What is the balanced chemical equation? How many grams of hydrogen are needed to produce 45.0 grams of methanol?

The balanced equation is: $2H_2+CO to CH_3OH$. One C, one O and 4 H on each side. The molar mass of methanol is $12+4+16=32$ $gmol^-1$ Number of moles: $n=m/M=45/32=1.41$ $mol$...

1 Answers 1 views
For $CH_4 +2O_2 -> CO_2 + 2H_2O$, the molar mass of oxygen gas ($0_2$) is 32.00 g/mol. The molar mass of carbon dioxide ($CO_2$) is 44.01 g/mol. What mass of $CO_2$, in grams, will form when 8.94 g $O_2$ completely react?

The balanced chemical equation tells us unequivocally that 16 g of methane gas reacts with 32 g of dioxygen gas to give 44 g of carbon dioxide, and 36 g...

1 Answers 1 views
What is the mole fraction of methanol in a solution that contains 6.0 mol of methanol and 3.0 mol of water? The formula for methanol is $CH_3OH$.

$chi_"MeOH"$ $=$ $"Moles of MeOH"/"Moles of methanol + moles of water"$ $(6.0*mol)/((6.0+3.0)*mol)=2/3$ as required............. What is the $"mole fraction of water?"$

1 Answers 1 views
Between $CH_3OH$ and $CH_3CH_2CH_2CH_2OH$, which is more volatile? Which has a greater surface tension? Which has a greater boiling point? Which would be more viscous?

The reason is, as a general rule, dispersion forces (such as van der Waals forces) between molecular such as these tend to be greater for large molecules. Also, stronger intermolecular...

1 Answers 1 views
$CO_2$ gas, in the dry state, may be produced by heating calcium carbonate. $CaCO_3 (s)DeltaCaO(s) + CO_2(g)$. What volume of $CO_2$, collected dry at 55 C and a pressure of 774 torr, is produced by complete thermal decomposition of 10.0 g of $CaCO_3$?

$10gramsCaCO_3(s) => CaO(s) + (?)O_2(g)$ $"moles" CaCO_3 = ((10g)/(100(g/(mol))))$ = $0.10"mole"$ From reaction ratios => moles $CaCO_3(s)$ consumed = moles $O_2(g)$ produced = 0.10 mole $(O_2(g))$**** If a 'dry'...

1 Answers 1 views
The concentration of $CO_2$ in a can of soda is approximately 0.045 M. If all of the $CO_2$ in a 12 ounce soda evolves from solution, how many liters would the $CO_2$ gas take up at STP?

The idea here is that you need to figure out how many moles of carbon dioxide, $"CO"_2$, are initially dissolved in the soda by using the volume and of...

1 Answers 1 views
How would you predict which compound in each of the following pairs is more soluble in water? Why? a) $CH_3OCH_3$ or $CH_3OH$? b) $Na_2CO_3$ or $CO_2$?

$b.$ $"Probably sodium carbonate......."$ Now methanol can engage in hydrogen with water and with itself, but dimethyl ether, while polar, does not engage in hydrogen bonding with itself but does...

1 Answers 1 views
Methanol, $CH_3OH$ is used as an antifreeze. How many grams of methanol would you need per 1000.0 g of water for an aqueous solution to stay liquid at -20.0° C?

Your strategy here will be to use the equation for freezing-point depression to determine the of the target solution, then use methanol's molar mass to find the mass of the...

1 Answers 1 views
For which equation, does the enthalpy of reaction represent $DeltaH_f^@$ for methanol? $1.$ $CO(g) + 2H_2(g) rarr CH_3OH(l)$ $2.$ $C(g) + 2H_2O(g) rarr CH_3OH(l)+1/2H_2(g)$ $3.$ $C(s) + 2H_2(g) +1/2O_2(g) rarr CH_3OH(l)$ $4.$ $C(g) + 2H_2(g) rarr CH_3OH$

The standard of formation is the enthalpy associated with the formation of 1 mole of substance from its constituent in their standard states under specified conditions. And of course...

1 Answers 1 views
X