问题
问答题
标准状况下，有氧气和氯气组成的混合气体共500mL，通入氢气，使其恰好完全燃烧，用水吸收，得250mL盐酸溶液，从中取出20mL，用0.08mol/LNaOH25mL恰好中和．试计算：
（1）盐酸溶液的物质的量浓度是______．
（2）与混合气体反应的氢气体积是______mL（标准状况）．
答案
（1）发生反应：HCl+NaOH=NaCl+H2O，HCl与NaOH按物质的量1：1反应，令盐酸溶液的物质的量浓度为cmol/L，
则25mL×c=25mL×0.08mol•L-1，解得c=0.08mol•L-1，故答案为：0.08mol•L-1 ；
（2）250mL溶液中n（HCl）=0.08mol•L-1×0.25L=0.02mol，
根据H原子守恒可知n（Cl2）=
×0.02mol=0.01mol，则V（Cl2）=0.01mol×22.4L/mol=0.224L，氧气的体积为500mL-224mL=276mL，1 2
H2+Cl2=2HCl
224mL 224mL
2H2+O2=2H2O
552mL 276mL
故通入氢气体积为224mL+552mL=776mL，
故答案为：776．
Catherine Destivelle is a rock star. She loves rock, but she can’t sing or play the guitar! She is a rock climber and a big star in France and Italy. She is the most famous woman climber in the world because she often climbs without ropes. She climbs in many countries but most often in the French Alps near Chamonix, where she lives. She started climbing near her home in Paris when she was five. Then, at fourteen, she joined the French Alpine Club to learn more, but immediately she climbed better and more quickly than the older members of the club. She won her first competition in Italy in 1995.