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Chapter 1: QCYL (page 9)

A sample of compound X ( a clear , colourless, combustible liquid with a noticeable odor) is analyzed and found to contain 14.13g carbon and 2.96g hydrogen. A sample of compound Y ( a clear , colourless , combustible liquid with noticeable odor ) is analyzed and found to contain 19.91g carbon and 3.34g hydrogen. Are these data an example of the law of definite proportions, the law of multiple proportions, or neither? What do these data tell about substance X and Y ?

Short Answer

Expert verified

The ratio of these ratio is 4.77/ 5.745 ~ 4/5. This small , whole number ratio supports the law of multiple proportions. This means that X and Y are different compounds.

Step by step solution

01

Define Law of multiple proportions

According to Dalton’s the law of multiple proportions, when two elements react to form more than one compound , a fixed mass of one element will react with masses of the other element in a ratio of small , whole numbers .

02

Check the mass ratio of carbon and hydrogen in the compounds.

Here , in the compound X , the mass ratio of carbon to hydrogen is : 14.13g C / 2.96g H.In compound Y , the mass ratio of carbon to hydrogen is 19.91g C/ 3.34g HThe ratio of these ratio is 4.77/ 5.745 ~ 4/5.This small , whole number ratio supports the law of multiple proportions.This means that X and Y are different compounds.

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Most popular questions from this chapter

How many significant figures are contained in each of the following measurements?

(a) 53 cm

(b) 2.05 × 108 m

(c) 86,002 J

(d) 9.740 × 104 m/s

(e) 10.0613 m3

(f) 0.17 g/mL

(g) 0.88400 s

Round off each of the following numbers to two significant figures:

(a) 0.436

(b) 9.000

(c) 27.2

(d) 135

(e) 1.497 × 10-3

(f) 0.445

An irregularly shaped piece of a shiny yellowish material is weighed and then submerged in a graduated cylinder, with results as shown.

(a) Use these values to determine the density of this material.

(b) Do you have any reasonable guesses as to the identity of this material? Explain your reasoning.

Give the name of the prefix and the quantity indicated by the following that are used with SI base units.

  1. c
  2. d
  3. G
  4. k
  5. m
  6. n
  7. p
  8. T

Write conversion factors (as ratios) for the number of:

(a) kilometers in 1 mile

(b) liters in 1 cubic foot

(c) grams in 1 ounce
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