40) The correct resonance structure for NCS- are, D) I and III --- 41) The numbe

Question

40) The correct resonance structure for NCS- are,

D) I and III

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41) The number of sp2 hybrid orbitals of C in CO3^2- are,

A) only 1

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42) Enthalpy change dH is,

dH = dU + PdV

with,

dU = 58 kJ = 58000 J

P = 1.5 atm

dV = 12.6 L

L.atm to J = multiply with 101.33 J

So,

dH = [58000 + 1.5 x 12.6 x 101.33]/1000 = 59.9 kJ

c) 59.9 kJ

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43) The balanced equation would be,

4PH3 + 8O2 --> P4O10 + 6H2O

sum of coefficients are,

C) 19

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44) Mass of 8.50 x 10^22 molecules of NH3 = 8.50 x 10^22 x 17 g/mol/6.023 x 10^23 = 2.40 g

C) 2.40 g

Explanation / Answer

40) Which of the following are allowed resonance forms of NCS.? and EN-C s A) only I B) only II C) only III D) I and III 41) The number of sp2 hybrid orbitals on the carbon atom in CO32- is A) one. B) two. C) three. D) four. 42) At a constant pressure of 1.50 atm what is the enthalpy change AH for a reaction where the internal energy change E is 58.0 kJ and the volume increase is 12.6 L? (1 Latm 101 32 A) 39.1 kJ B) 56.1 kJ C) 59.9 kl D) 76.9 kJ 43) What is the sum of the coefficients when the following equation is balanced using the lowest whole-numbered coefficients? PH3(g) +--O2(g) --P40 10(s) + __ H2o@ A) 10 B) 12 C) 19 D) 22 44) What is the mass of 8.50 x 1022 molecules of NH3? A) 0.00830g B) 0.417 g C) 2.40 g D) 120 g

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