chem practice final

chem practice final - Molar masses that you may find useful...

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Molar masses that you may find useful… NO = 30.01 g/mol PbS = 239.27 g/mol PCl3 = 137.32 g/mol Ca3(PO4)2 = 310.18 g/mol Al2O3 = 101.96 g/mol Ba3(PO4)2 = 601.93 g/mol Fe2O3 = 159.7 g/mol C6H12O6 = 180.2 g/mol Fe(NO3)3 = 241.9 g/mol Al(NO2)3= 165.01 g/mol H2SO4 = 98.12 g/mol C8H18 = 114.22 g/mol CH4 = 16.04 g/ mol H2S = 34.09 g/mol K3PO4 = 212.27 g/mol NO2 = 46.01 g/mol H2O = 18.02 g/ mol HNO3 = 63.02 g/mol Ag2SO4 = 311.81 g/mol AgNO3 = 169.88 g/mol KNO3 = 101.11 g/mol 1. Which of the following molecules/compounds has the weakest intermolecular forces? a. CF4 b. CCl3H c. Br2 ` d. CH3OH e. NF3 2. According to the following reaction, if 2.0 mol of CO is reacted with 2.0 mol of I2O5, how many moles of CO2 will form? 5CO(g) + I2O5(s) . . 5CO2(g) + I2(s) a. 1.0 mol b. 2.0 mol c. 0.40 mol d. 5.0 mol e. 10.0 mol 3. Which of the following is NOT a molecular (covalent) compound? a. N2H4 b. (NH4)2CO3 c. C3H8 d. NCl3 e. All of the above are molecular compounds. 4. Convert 3.09 x 106 ng/cm3 into units of mg/m3. a. 3.09 x 106 mg/m3 b. 3.09 x 102 mg/m3 c. 3.09 x 1010 mg/m3 d. 3.09 x 104 mg/m3 e. 3.09 x 108 mg/m3 5. Which of the following is a weak acid? a. HClO4 b. HBr c. HC2H3O2 d. HNO3 e. All of the above are weak acids. 6. Write out the balanced chemical reaction that occurs when magnesium solid reacts with aqueous aluminum sulfate to form aluminum solid and aqueous magnesium sulfate. What is the coefficient in front of the magnesium sulfate? a. 1 b. 2 c. 3 d. 4 e. 6
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7. How many molecules of N2H4 are contained in 25.9 g of N2H4? a. 8.08 x 1023 N2H4 molecules b. 1.24 x 1023 N2H4 molecules c. 1.56 x 1023 N2H4 molecules d. 6.02 x 1023 N2H4 molecules e. 4.87 x 1023 N2H4 molecules 8. Determine the ground state electron configuration of the As (Z = 33) ION. a. [Ar]4s23d10 b. [Xe] c. [Ar] d. [Ar]4s23d104p3 e. [Ar]4s23d104p6 9. Determine the pH of a 0.113 M Sr(OH)2 solution. a. 0.646
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chem practice final - Molar masses that you may find useful...

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