In adding the measurements 11.074 m, 18.2 m, and 16.943 m, what should be the number of significant figures in the result?

Answer :  The correct answer will be 46.2 m.

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

The rule apply for the addition and subtraction is :

The least precise number present after the decimal point determines the number of significant figures in the answer.

Given : The sum of the measured values 11.074 m, 18.2 m, and 16.943 m.

In the given expression, 11.074 has 5 significant figures, 18.2 has 3 significant figures and 16.943 has 5 significant figures. From this we conclude that least precise number present after the decimal point is 1.

Thus, the answer will be 46.2 m.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)