Q. 2.17 - An Introduction to General, Organic, and Biological Chemistry

Question

Identify the numbers in each of the following statements as measured or exact:

(a) A patient has a mass of $67.5 kg$.

(b) A patient is given $2$ tablets of medication.

(c) In the metric system, $1$$L$ is equal to $1000 ml$.

(d) The distance from Denver ,Colorado, to Houston, Texas, is $1720 km$.

Step-by-Step Solution

Answer

(a) Measured , as it is mass.

(b) Exact, as it is tablets doses.

(c) Exact, as it is universally accepted.

(d) Measured, as distance is always measured.

Part(a) Step1 : Given information.

We have been given mass of patient $=67.5 kg$.

We need to state whether this statement is exact or measured.

Part(a) Step2 : Simplify.

 Measured. Since it is mass so it is obvious that it will be measured. Mass can vary from person to person ,therefore it is measured.

Part(b) Step1 : Given information.

We have been given that, a patient is given two tablets of medication.

We need to state whether this statement is exact or measured.

Part(b) Step 2: Simplify.

Exact. It is recommendation by doctor for use of tablets, therefore it is exact. It denotes the number of doses to be taken so, it can not be measured.

Part(c) Step1 : Given information.

We have been given that in metric system $1L$ is equals to $1000 mL$.

We need to state whether this statement is exact or measured.

Part(c) Step2: Simplify.

 Exact. Since it is universal, therefore it is exact. In metric system it has been already accepted and used globally ,hence it is always exact.

Part(d) Step1: Given information.

We have been given the distance between different states .

We need to state whether this statement is exact or measured.

Part(d) Step2 : Simplify.

 Measured. The distance between different states is measured . 

Distance is fundamental quantity ,hence it is measured .