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magnesium oxide has a high melting point carbon dioxide has a low melting point which row identifies the attractive forces that are broken when these compunds are melted
In the case of Silicon dioxide, two different types of bonding is present. It is because, in it, each silicon atom is bonded with four oxygen atoms and each oxygen...
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Calculate the standard entropy of melting of ice ,if it's melting 0oc and given the standard enthalpy of melting point 600j/mol
ΔH = 600 J/molT = 273 Kwe know, S= ΔH/TS = 600 Jmol-1/273 K = 2.19 Jmol-1k-1 Hence,the standard entropy of melting of ice is 2.19 Jmol-1k-1
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Why is a melting range observed, rather then a "sharp" melting point?
Sharp melting point is characteristic to pure substances and reason of some melting range is impurity. in General in our world there are not a lot of 100% pure substances....
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what is the chemical properties of chloroxylenol? since it is a substituent of phenol, does it have the same chemical properties as phenol groups?
Boiling Point =246 °CDensity =1.183 g/cm3Appearance=White or cream crystalline powderMelting Point =114-116 °CYes
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What is the effect of a small amount of impurity on the melting point of an organic compound?
Decreases melting point
Elevates melting point
Stagnates melting point
None of the above
A small amount of impurity decreases melting point an organic compound
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How much ammonia (NH3) could be melted by the addition of 3.5 kJ of heat, if the temperature of the liquid is at the melting point? (ΔHfus=5.66 kJ/mol)
Q=ΔHfus·n n=m/M M (NH3)=17 g/mol m (NH3)=(Q·M)/ΔHfus m (NH3)=(3.5·17)/5.66=10.5 g
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Calculate the heat required to melt 7.87 g of benzene at its normal melting point.
Heat of fusion (benzene) = 9.92 kJ/mol
Mollar mass (C6H6) = 78 g/mol n = 7.87 / 78 = 0.101 (mol) Q = 0.101 * 9.92 = 1.002 (kJ)
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calculate the entropy change of melting of ice,if its melting point is 0C,Given that the standard entalpy of melting ice is 600Jmol
ΔH = 600Jmol-1 T = 2730K S - ? S = ΔH/T S = 600Jmol-1/2730K = 2,20 Jmol-1K-1
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The melting point of a pure solvent is -116.3 C. If 352 g of an ionic solid is added to 567.7g of the solvent, the new melting point is -121.6 C. What is the molar mass of the ionic solute?
delta T = i•Kf•molalityMolality = moles / kg solventYou have molality and kg solvent, solve for moles.Moles = grams / molar mass. You have moles and grams, solve for molar...
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Poly melts at approximately at 327 degrees celsius. If the heat of fusion is 5.28 kJ mol ^-1, what is the molar entropy change oc fusion?
Temperature T=327OC=600K Heat, q=600×5.28kJ Entropy change, ΔS=K 600×5.8kJ=3480KJ(3480)/(6.023)(1023) = 5.778-21
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