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Chemistry
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12 Dec 2019

Which of the following represents 1 mol of phosphine gas, PH3?

Choose one of the following options

34.00 g phosphine gas

22.4 L phosphine gas at STP

none of the above

all of the above

6.02 x 1023 phosphine molecules

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Related questions

Given the electronegativity values of H (2.1), C (2.5), P (2.1), S (2.5), and I (2.5), which of the following molecules have polar bonds?

Select one:

A. phosphine, PH3

B. carbon tetraiodide, CI4

C. carbon disulfide, CS2

D. all of the above

E. none of the above

Which of the following represents 1 mole of diborane gas,B2H6?
a. 22.4 L diborane gas at STP
b. 27.68 g diborane gas
c. 6.02 รƒย— 1023 diborane gas molecules
d. all of the above
e. none of the above

Phosphine (PH3) decomposes into phosphorus and molecular hydrogen:
4PH3(g) รขย†ย’ P4(g) + 6H2(g)
Experiments show that this is a first-order reaction, with a rate constant of 0.0173 s-1 at 650ร‚ยฐC. Identify each of the following statements about this reaction as true or false. (Use the drop-down menu and select "True" or "False" for each. You must get all 4 correct.)
True/False The mechanism for this reaction must involve two or more elementary steps.
True/False The activation energy for the reaction cannot be determined without additional data.
True/False The rate constant would be smaller than 0.0173 s-1 at 500ร‚ยฐC.
True/False The rate-determining step for the reaction could involve a bimolecular collision between two PH3 molecules.

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