1. I played football yesterday. --> I have played football recently. --> I was playing football yesterday all day long. 2. I worked with my mother at home yesterday. --> I have already worked with my mum. --> I was working with my mom yesterday. 3. I went to the cinema last week. --> I have gone to the cinema recently. --> While I was going to the cinema, my friend broke his leg. 4. I didn't do my homework. --> I haven't done my homework yet. --> I wasn't doing my homework all day long. 5. I made an apple pie one month ago. --> I have already made an apple pie. --> I was making an apple pie when you came home.
Дано m (AgNO3)= 17г m ( Ca (NO3)2 )= 22,2г найти m (AgCl)=? Находим молярную массу М (AgNO3)= 107,8+14+3*16=169,8 ((( М 2(AgNO3)= 2*169,8 =339,6 ))) М ( CaCl2 )=40+2*35,5=111 М ( AgCl )= 107,8+35,5=143,3 (((М 2( AgCl )= 2*143,3=286,6 ))) CaCl2 + 2 AgNO3 == Ca (NO3)2 + 2 AgCl 111 ---339,6286,6 22,217(х3) (Х1)= (22,2*339,6)/111= 67,92г Для 22,2грама CaCl2 нужно 67,92г грамма AgNO3 (Х2)= (17*111)/339,6= 5,55 г Для 17грам AgNO3 нужно 5,55 грам CaCl2 Потому AgNO3 прореагирует полностью а часть CaCl2 останется у растворе а точнее 22,2-5,55=16,65 грам. (Х3)= (17*286,6)/339,6= 14,346г ответ 14,346 грам AgCl выпадет в осадок.
Судя по тому как животные ведут себя в зоне красной книги можно понять, что верный ответ - 11