Be sure to answer all parts. carry out the following operations as if it were a calculation of real experimental results. express the answer with the correct number of significant figures. (3.26 × 10−3 mg) − (7.88 × 10−5 mg ) answer units mg enter your answer in standard form. do not use scientific notation.

Answer : The answer in standard form is, 0.00318 mg.

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.

As we are given :

First we have to convert scientific notation into standard form.

As per rule, the least precise number present after the decimal point is 5. So, the answer will be, 0.00318 mg.

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.