Cho 1,86 gam hỗn hợp Al và Mg tác dụng với dung dịch HNO3 loãng dư, thu được 560 ml lít khí N2O (đktc, sản phẩm khử duy nhất) bay ra. Tính khối lượng muối nitrat tạo ra trong dung dịch.

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3. Present perfect and past simple 1. Those three kids .............................outside without an adult(never/go) 2.My younger brother................(be)really annoying when he ............a child(be) 3.Susan's favourite sport ...........(be) tennis;then she...........ping pong(discover) 4.He...............................a full-time job(never/have) 5.How many times.......................that movie?(see/he) 6.since what age..........................soccer?(play/you) 7..................................................................a ghost?(see/you/later) 8.......................................................................................to oktoberfest last year ? ( go /they) 9........................................anything interesting last night ? ( cook/you) 10...........................................tennis recently(play/you) 11 how many cities............................in(live/you) 12 ............late for last night's concert?(be/we) 13 what................for breakfast this morning?(eat/you) 14 how many boyfrs..................... ?(have/she) 15 there...........a lot of car accidents at that intersection last winter(be) 16 i live in munich now. i .........there for 2 years ( be ) 17 last night there......................a really funny show on tv(be) 18 steven.....................(get) a car when he ..............................sixteen(turn) 19 i...........................(play) soccer since i ..............................five(be) 20 they .................................a farm 2 week ago( to visit) HELP ME!!!!!!!!Mai mình phải nộp rồi mngg ạ