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s344n2d4d5 [400]
1 year ago
12

Calculate the percentage by mass of nitrogen in magnesium nitrate. You will need the information below. Give your answer to the

nearest whole percentage (e.g. 34%).

Chemistry
1 answer:
lianna [129]1 year ago
7 0

From the calculations, the percentage by mass of the nitrogen is 18.9 %..

<h3>What is the percentage by mass?</h3>

The term percentage by mass refers to the mass of an atom that is contained in a compound.

Hence, the compound magnesium nitrate has the formula Mg(NO3)2. The molar mass of the compound is 24 + 2(14 + 3(16)) = 148 g/mol.

The percentage by mass of nitrogen is; 28/ 148  * 100/1 = 18.9 %.

Learn more about percentage by mass:brainly.com/question/16885872

#SPJ1

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The two angles would be both 41 degrees.
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x in this case would be 14 degrees.
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A student experimentally determines the density of a metal cube. The edge length of the cube is measured using calipers. The cub
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Answer:

10.9%.

Explanation:

The first thing to do in order to solve this question is to Determine the value for the volume of the the cube. This can be done by taking the cube root of the length of the cube;

The volume of the cube = (length of the cube)^3 = length × length × length = 1.72 × 1.72 × 1.72 =( 1.72)^3 = 5.09cm^3.

The next thing you do is to Determine the exponential density, the can be done by using the formula below;

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Therefore, the percent error = (true density of the cube - exponential density of the cube)÷ true density of the cube × 100.

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2 years ago
What is the idea behid boyles law​
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Explanation:

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Structure of isobutyl formate
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How many moles of KNO3 are in 500 mL of 2. 0 M KNO3? mol KNO3.
8090 [49]

The moles can be defined as the mass of the substance with respect to molar mass. The moles of potassium nitrate is 1 mol.

<h3>How to calculate moles of a substance?</h3>

The moles of a compound can be calculated from:

\rm Moles=\dfrac{Mass}{Molar\;mass}

The molarity can be defined as the moles of solute in a liter of solution.

The molarity can be expressed as:

\rm Molarity=\dfrac{Moles\;\times\;1000}{Volume\;(mL)}

The molarity of potassium nitrate solution is 2 M, and the volume is 500 mL.

The moles of potassium nitrate is given as:

\rm 2\;M=\dfrac{Moles\;\times\;1000}{500\;mL}\\ Moles=\dfrac{2\;\times\;500}{1000}\;mol\\ Moles=1\;mol

The moles of potassium nitrate in 2 M, 500 mL solution are 1 mol.

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