Use Table A provided in this exam to answer this question A 5.00 g sample of one
ID: 969621 • Letter: U
Question
Use Table A provided in this exam to answer this question A 5.00 g sample of one of the substances listed. Table A was heated from 34.3 degreeC to 64.2 degree C. requiring 133 J to do so. Which substance was it? H_2O(l) Al(s) Fe(s) Hg(l) C(s) Predict which pair of substances would form molecular solids. CO_2 and NaCl CH_4 and CO_2 CH_3OH and CaCO_3 CH_3OH and KBr None of these The graph on the right shows the vapor pressures of four substances at various temperatures are. If the atmospheric pressure was 80 KPa. Which substances could boil at 60 degree C? Ethanol Ethanol, Water, and Ethanoic Acid Chloroform Chloroform. Ethanol None of the substanceExplanation / Answer
3)
mass = m = 5.00 g
dT = 64.2 - 34.3 = 29.9 oC
Q = 133 J
Q = m Cp dT
133 = 5 x Cp x 29.9
Cp = 0.90 J / oC g
this is belongs to Al
answer : B ) Al
4)
answer : B ) CH4 and CO2
explanation : covalent compounds form molecular crystals
5) D ) chloroform , ethanol
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