Oxygen gas o 2 is generated by a reaction in a closed

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1307_exam 2_fall2018FORMC.pdf

14 )   The amount of calcium present in milk can be determined by adding excess oxalate ion to a sample and measuring the mass of calcium oxalate that precipitates . What is the mass percent of calcium in milk if 0.429 g of calcium oxalate forms in a 125.0 g sample of milk when excess aqueous sodium oxalate is added ? The molar mass of calcium oxalate is 128.097 g / mol and the reaction that forms the calcium oxalate precipitate is : Na 2 C 2 O 4 ( aq ) + Ca 2 + ( aq ) → CaC 2 O 4 ( s ) + 2 Na + ( aq )
A ) 1.10 %
B ) 0.343 %
C ) 1.37 %
D ) 0.107 %
E ) 0.202 %
15 )   Oxygen gas ( O 2 ) is generated by a reaction in a closed container . The oxygen gas is collected over a sample of liquid water , some water evaporates inside the flask to exert a partial pressure of 22.4 mm Hg. If the total pressure inside the closed container is 756.7 mm Hg , what is the oxygen partial pressure ?
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16 )   A compressed gas cylinder containing 3.50 mol methane ( CH 4 ) has a volume of 1.30 16 ) L. What pressure does the methane exert on the walls of the cylinder if its temperature is 25 .° C ?
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L.   What pressure does the methane exert on the walls of the cylinder if its temperature is 25 .°C ?
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17 )   Hydrogen gas exerts a pressure of 466 . torr in a container . What is this pressure in atmospheres ? ( 1.000 atm = 760 . mm Hg = 760. torr )
A ) none of these choices
B ) 4.60 atm
C ) 0.613 atm
D ) 1.63 atm
E ) 0.217 atm
19 )   Potassium chloride , KCl , sodium sulfate , Na 2 SO 4 , a sugar called glucose , C 6 H 12 O 6 , carbon dioxide , CO 2 and ammonium phosphate , ( NH 4 ) 3 PO 4 , are all soluble in water . 19 ) Which one produces the largest number of dissolved particles per mole of dissolved solute ?
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20 )   In a redox reaction , electrons are transferred
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21 )   Calculate q when 57.2 g of water is heated from 10.00 ° C to 38.15 ° C. The specific heat of water is 4.18 J / g C o .
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22 )   Benzene ( C 6 H 6 ) is a hydrocarbon . Write and balance a chemical reaction for the combustion of benzene in oxygen . When properly balanced ( no fractions ) , what is the sum of all stoichiometric coefficients .
A ) 22
B ) 25
C ) 29
D ) 19
E ) 35
23 )   The combustion of glucose ( C 6 H 12 O 6 ) with oxygen gas produces carbon dioxide and water . This process releases 2803 . k J per mole of glucose that reacts . When 6.00 mol of oxygen react in this way with glucose , what is the energy release in kcal ? ( Hint : Write a balanced equation for the combustion process , 1 cal = 4.18 J )
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15) Oxygen gas (O2) is generated by a reaction in a closed container. The oxygen gas iscollected over a sample of liquid water, some water evaporates inside the flask to exerta partial pressure of 22.4 mmHg. If the total pressure inside the closed container is756.7 mmHg, what is the oxygen partial pressure?A) 779.1 mmHgB) 756.7 mmHgC) 734.3 mmHgD) 19.9 mm HgE) 117 atm15)
16) A compressed gas cylinder containing 3.50 mol methane (CH4) has a volume of 1.30L. What pressure does the methane exert on the walls of the cylinder if its temperatureis 25.°C?16)
17) Hydrogen gas exerts a pressure of 466. torr in a container. What is this pressure inatmospheres? (1.000 atm = 760. mmHg = 760. torr)
17)18) Which one of the following is nota redox reaction?
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)
)
)
3
19) Potassium chloride, KCl, sodium sulfate, Na2SO4, a sugar called glucose, C6H12O6,carbon dioxide, CO2and ammonium phosphate, (NH4)3PO4, are all soluble in water.Which one produces the largest number of dissolved particles per mole of dissolvedsolute?19)A) (NH4)3PO4B) CO2C) Na2SO4D) C6H12O6E) KCI
20) In a redox reaction, electrons are transferred

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