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Chemistry

  • $1.79 1 047 moles of Sodium were reacted with 26g
    1. 0.47 moles of Sodium were reacted with 26g of Copper(II) Nitrate? If the actual yield of copper metal was 1.43g, what is the percentage yield of this reaction? 2. What is the equivalent of 456 torr in atmospheres...

  • $1.79 1 A compound whose empirical formula is CH3
    1. A compound whose empirical formula is CH3 has a molar mass of 30 g/mol. What is its molecular formula? (3 points) 2. Find the molecular formula for each of the following compounds: (6 points) a) 30.5% nitrogen; 69...

  • $1.79 1 Describe a method that could be used to se
    1. Describe a method that could be used to separate the components of the following a) Sand and iron filings b) Sawdust and lead pellets c) Salt and glass particles d) Silt (water and fine soil particles) e) Alcohol...

  • $1.79 1 identify the ions in (NH4)2Cr2O7 2 For
    1. identify the ions in (NH4)2Cr2O7 2. For a nonmetal in Group 5A of the Periodic Table, the most common monatomic ion will have a charge of what? 3. What is the molar mass of ammonium sulfate? 4. How many moles...

  • $1.79 1 The temperature of the warm water bath is recorded to
    1. The temperature of the warm water bath is recorded too high. How will this technique error affect the reported activation energy for the reaction - too high or too low? explain 2. Arnie's data plot has a greater negative...

  • $1.79 1 What is the pressure of a sample of 35g of
    1. What is the pressure of a sample of 35g of nitrogen gas in a 5.6L container at 90oC? . 2.What is the shape of the carbonate ion, (CO3)2-? a. What is the total number of valence electrons? b. Identify the...

  • $1.79 100 mol Zn reacts with excess hydrochloric a
    1.00 mol Zn reacts with excess hydrochloric acid, 1.00 mol H2 gas is produced. At 25‚ºC and 1.00 atm= 101,325 Pa, this amount of H2 occupies 24.5 L (= 24.5 x10-3 m3). How much work is done by the chemical system.

  • $1.79 3 Using the bond energies below, determine t
    3. Using the bond energies below, determine the value and sign of ˆ€ H for the Reaction: 2H-Br + F-F € €™ 2H-F + Br-Br Bond energies in kJ/mole: H-Br 362.3 H-F 565 F-F 154.8 Br-Br 190.0 4. When a mole of...

  • $1.79 9 38 A mixture of Na2CO3 and BaCO3 weighing 0 2000 g re
    9.38. A mixture of Na2CO3 and BaCO3 weighing 0.2000 g requires 30.00 mL of 0.1000 N acid for complete neutralization. What is the percentage of each component mixture?

  • $1.79 A 1 Liter buffer solution with ph 905 is des
    A 1 Liter buffer solution with ph 9.05 is desired. One of the two ingredients of the buffer is HCN, Ka = 4.93 x 10^-10. a) what could the other compound be? b) Suggest a suitable ratio and determine the exact moles...




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