Need a bit of homework help about % mass of elements

In summary, % mass of elements refers to the relative amount of a specific element in a substance or compound, expressed as a percentage of the total mass. It is calculated by dividing the mass of the element by the total mass and multiplying by 100. This is important in chemistry for determining composition and properties, identifying substances, and predicting reactions. % mass of elements can change in different reactions or processes, and can also be used in everyday life for nutritional, purity, and environmental analysis purposes.
  • #1
rpatel
7
0
Calculate the percentage by mass of the elements shown in the following compounds

A) Br in MgBr2

b) O in Ca(NO3)2

c) N in NH4NO3


any help is appreichated

thanks

regards
 
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  • #2
the percent mass will be equal to [mass of element in compound]/[mass of total compound]*100%. The only thing to watch out for is when a compound has a few atoms of the same element in it. [ie: for the first one you have 2 bromide ions so the answer would be 2*molecular mass of bromide / mass of magnesium (II) bromide * 100%]
 
Last edited:
  • #3
thank you. :smile:
 

Related to Need a bit of homework help about % mass of elements

What is the meaning of "% mass of elements"?

% mass of elements refers to the relative amount of a specific element present in a given substance or compound. It is usually expressed as a percentage of the total mass of the substance or compound.

How is % mass of elements calculated?

% mass of elements is calculated by dividing the mass of the specific element by the total mass of the substance or compound, and then multiplying by 100 to get the percentage.

Why is % mass of elements important in chemistry?

% mass of elements is important in chemistry because it helps to determine the composition and properties of substances and compounds. It also aids in identifying unknown substances and predicting their behavior in chemical reactions.

Can % mass of elements change?

Yes, % mass of elements can change depending on the type of reaction or process that the substance or compound undergoes. For example, in a chemical reaction, the reactants will have different % mass of elements compared to the products.

How can % mass of elements be used in everyday life?

% mass of elements can be used in everyday life to understand the nutritional value of foods, determine the purity of substances, and even in environmental studies to analyze the composition of soil or water samples.

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