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A 2.85g sample contains 0.82 magnesium ,0.41 carbon,1.62g oxygen,what is the percent composition of each?​

Sagot :

Solution:

Step 1: Write the general formula.

[tex]\text{percent by mass of an element} = \frac{\text{mass of an element}}{\text{mass of a compound}} × 100[/tex]

Step 2: Calculate the percent composition of each element using the general formula.

For Mg

[tex]\text{percent by mass of Mg} = \frac{\text{mass of Mg}}{\text{mass of a sample}} × 100[/tex]

[tex]\text{percent by mass of Mg} = \frac{\text{0.82 g}}{\text{2.85 g}} × 100[/tex]

[tex]\boxed{\text{percent by mass of Mg = 28.77\%}}[/tex]

For C

[tex]\text{percent by mass of C} = \frac{\text{mass of C}}{\text{mass of a sample}} × 100[/tex]

[tex]\text{percent by mass of C} = \frac{\text{0.41 g}}{\text{2.85 g}} × 100[/tex]

[tex]\boxed{\text{percent by mass of C = 14.39\%}}[/tex]

For O

[tex]\text{percent by mass of O} = \frac{\text{mass of O}}{\text{mass of a sample}} × 100[/tex]

[tex]\text{percent by mass of O} = \frac{\text{1.62 g}}{\text{2.85 g}} × 100[/tex]

[tex]\boxed{\text{percent by mass of O = 56.84\%}}[/tex]

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