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blsea [12.9K]
3 years ago
9

PLEASE HURRY! What is the name of this alkane?

Chemistry
1 answer:
belka [17]3 years ago
7 0

Answer:

C. 1-ethyl, 3-methylcyclohexane

(Photo for proof at the bottom.)

Explanation:

The 1-ethyl is because you start numbering from the longest branch, towards the next closest branch. Prefix "eth-" means two, there are 2 carbons in the longest branch. 3-methyl is because the next branch is at number 3, and prefix "meth-" means 1, there is 1 carbon in that chain. "Cyclo" in cyclohexane means the skeletal model is shaped like a ring, and the "hexane" means there are 6 carbons in the ring. Prefix "hex" means 6.

Here's a photo of the unit review on Edge. Refer to the 2nd attachment for a visualization.

Please click the heart if this helped.

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Answer:

  • <u>0.01320g</u>

Explanation:

All the cobalt in the sample is in the precipitate, so you need to determine the amount of cobalt in the precipitate.

<u>1. Calculate the molar mass of CoHg(SCN)₄</u>

Atom  Number of atoms    Atomic mass      Product

                                                   g/mol             g/mol

Co                   1                         58.933             58.933

Hg                   1                         200.59            200.59

S                     4                         32.065             128.26

C                     4                         12.011              48.044

N                     4                          14.007            56.028

                                                                        =========

                                                 Molar mass:     491.855

<u>2. Set a proportion</u>

  • 58.933g of Co / 491.855 g of compound = x / 0.1102 g of compound

Clear and compute:

  • x = 0.1102 × 58.933 / 491.855 g of Co
  • x = 0.01320393 g

Round to four significant figures: 0.01320g of cobalt ← answer

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