Question

某硝酸銨（NH₄NO₃）樣品（雜質(zhì)不含氮）中氮元素的質(zhì)量分?jǐn)?shù)為24.5%，則其中硝酸銨的質(zhì)量分?jǐn)?shù)是

A．20%

B．70%

C．80%

D．無法計(jì)算

Answer 1

B

分析：先計(jì)算出純凈硝酸銨中氮元素的質(zhì)量分?jǐn)?shù)，再計(jì)算樣品中NH₄NO₃的質(zhì)量分?jǐn)?shù)；根據(jù)混合物中某化合物的質(zhì)量分?jǐn)?shù)= ×100%，進(jìn)行分析解答．
解答：解：純凈硝酸銨中氮元素的質(zhì)量分?jǐn)?shù)=××100%=35%，
硝酸銨（NH₄NO₃）樣品樣品中NH₄NO₃的質(zhì)量分?jǐn)?shù)為：×100%=70%．
故選B．