Ex-2-1413-F12

# Calculate the number of grams of p 4 o 10 that are

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Calculate the number of grams of P 4 O 10 that are required to react with an excess of H 2 O to produce 600 grams of H 3 PO 4 .

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Version B (12) 2. When aluminum nitrate, Al(NO 3 ) 3 (aq), reacts with sodium carbonate, Na 2 CO 3 (aq) in solution, solid aluminum carbonate, Al 2 (CO 3 ) 3 (s), precipitates from solution. When 600 mL of 0.40 M Al(NO 3 ) 3 (aq)is mixed with 900 mL of 0.30 M Na 2 CO 3 (aq), then, at the completion of the reaction, calculate: (6) (a) the number of grams of Al 2 (CO 3 ) 3 (s)) which will be produced. (6) (b) which reactant, Al(NO 3 ) 3 (aq) or Na 2 CO 3 (aq), is in excess (and remains in solution), and what will be it’s Molar concentration at the conclusion of the reaction.
Version B (10) 3. A 200 g sample of propane gas, C 3 H 8 (g), is initially at 350 o C and 540 torr. The sample is cooled at constant pressure to 100 o C. During this process, the volume decreases from 125 L to 75 L. The constant pressure heat capacity of propane is 74. J/mol- o C. Calculate q, w and E for this process, all in kJ (kJoules).

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Version B (10) 4. Consider the thermal decomposition of an unknown metal carbonate, X 2 (CO 3 )(s): 2 3 2 2 ( ) ( ) ( ) Heat X CO s X O s CO g  When 60. grams of X 2 CO 3 is decomposed, 25.0 grams of CO 2 are produced. What is the molar mass of the unknown metal; i.e. what is M(X)?
Version B (10) 5. Sodium Oxalate, Na 2 C 2 O 4 , is a salt which is contained in some minerals. The amount of Na 2 C 2 O 4 present in a sample can be determined by titration with potassium permanganate, KMnO 4 , via the titration equation: 2 2 4 4 4 2 4 2 4 2 2 5 ( ) 2 ( ) 2 ( ) ( ) 5 ( ) 10 ( ) 8 ( ) Na C O aq KMnO aq MnSO aq K SO aq Na SO aq CO g H O l If one dissolves the Na 2 C 2 O 4 in a 80 g mineral sample into water, 280. mL of 0.040 M KMnO 4 is required to react completely with the Na 2 C 2 O 4 . Use this information to calculate the mass percent of Na 2 C 2 O 4 in the mineral sample.

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