The calculated yield for carbon dioxide was 546 grams, but the measured yield was 483grams. what is the percent yield?

  The percent yield is:  88.5 % .

Explanation:

Percent yield = (actual yield / theortical yield) * 100 ;  then add the "%" sign.

Percent yield = (483 g / 546 g) * 100  = (483/546) * 100 =

0.8846153846153846 * 100 = 88.46153846153846 %  ;

  round to 3 (THREE) significant figures;    =   88.5 % .