(2004? Longyan) shows the label on a packaging bag with calcium salt. Xiao Ming uses the following methods to detect the calcium content in salt: put the salt in a container.

(1) According to the law of conservation of mass, the mass of CO2 produced during the reaction is: 200.00g+30.00g-229.67g = 0.33g 0.33g..

(2) let the mass of calcium carbonate contained in the salt be x.

CaCO3+2HNO3=Ca(NO3)2 +CO2↑+H2O

100 ? Forty-four

x？ 0.33 g

100: 44 = x: 0.33g.

X = 0.75g

30.00 grams of salt contains 0.75 grams; Calcium carbonate;

(3) The mass fraction of calcium in the salt with calcium is 0.75g× 40100x100% 30.00g×100% =1.0%,

According to the label calcium: 1.3% > 1.0% > 0.3%.

Therefore, the calcium content of this calcium salt meets the label requirements.