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2 years ago

A ruler has smallest graduations that increase by 1 cm

Chemistry

1 answer:

Tatiana [17]2 years ago

7 0

The acceptable measurement of the length of the piece of paper is 3.5 cm.

<h3>What is measuring accuracy of a ruler?</h3>

The measuring accuracy of ruler determines how precise or accurate the length of an object is measured.

The limit of accuracy of a ruler is indicated by how "precisely" you can read the length on that ruler's scale—that is, how well you can estimate between the marks.

In a ruler the distance between the closest marks is 0.1 cm.

This implies that the measuring accuracy of meter rule is 0.1 cm.

The acceptable measurement of the length of the piece of paper is calculated as follows;

length = (3 cm + 4 cm)/2 = 3.5 cm

Thus, the acceptable measurement of the length of the piece of paper is 3.5 cm.

Learn more about measuring accuracy of meter rule here: brainly.com/question/16548360

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Answer:

A solution is made by dissolving 4.87 g of potassium nitrate in water to a final volume of 86.4 mL solution. The weight/weight % or percent by mass of the solute is :

2.67%

Explanation:

Note : Look at the density of potassium nitrate in water if given in the question.

You are calculating weight /Volume not weight/weight % or percent by mass of the solute

Here the weight/weight % or percent by mass of the solute is asked : So first convert the VOLUME OF SOLUTION into MASS

Density of potassium nitrate in water KNO3 = 2.11 g/mL

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Volume of solution = 86.4 mL

$2.11=\frac{mass}{86.4}$

$mass = 2.11\times 86.4$

$mass=182.3grams$

Mass of Solute = 4.87 g

Mass of Solution = 183.2 g

w/w% of the solute =

$= \frac{mass\ of\ solute}{mass\ of\ solution}\times 100$

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w/w%=2.67%

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