Hoà tan 400 ml dung dịch Na2CO3 0,5M vào 100 ml dung dịch CaCl2 1M thu được dung dịch X và m gam kết tủa. a) Tính m b) Tính nồng độ mol của các chất trong dung dịch X.

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change the following sentences from active into passive form 1 they believe that the wanted man is living in new york ................................................................................................... 2they say that many people are homeless after the food .................................................................................................... 3They know that the Prime Minister is in favor of the new law .......................................................................................................... 4They think that the prisoner escaped climbing over the wall ............................................................................................................ 5they believe that the thieves got in through the kitchen ............................................................................................................ 6They report that two people were seriously injured in the accident ..................................................................................................................... 7They say that three men were arrested after the explosion ........................................................................................................................ 8People believed that 13 is an unlucky number ............................................................................... 9They see that john is brightest student in class ,................................................................................ 10 People belived that the earth stood still ............................................................................