Need a bit of homework help about % mass of elements

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The discussion focuses on calculating the percentage by mass of specific elements in chemical compounds. The compounds analyzed include magnesium bromide (MgBr2), calcium nitrate (Ca(NO3)2), and ammonium nitrate (NH4NO3). The formula for calculating percent mass is defined as [mass of element in compound]/[mass of total compound]*100%. Special attention is required for compounds with multiple atoms of the same element, as demonstrated in the calculation for magnesium bromide.

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rpatel
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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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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%]
 
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thank you. :smile:
 

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