3. б)гідроксид натрію; в шестом для определения кислоты бумагу ещё можно использовать универсальную индикаторную бумагу, метиловый оранжевый (станет розовым); 7. Находим молярную массу CaCO3: M(CaCO3)= 40+12+16*3=100(г/моль), дальше находим массу: m (CaCO3)=n*M=0,4*100=40(г).ответ: масса CaCO3 40 г. 8. Находим количество вещества аммиака: n(NH3)=m /M; M (NH3)=14+1*3=17(г/моль); n(NH3)= 3,4/17=0,2(моль); N(NH3)= n*N(a), где N(a)-постоянная Авогадро; N(NH3)=0,2*6,02*10^23=1,204*10^23(молекул),а для атомов умножим на 4,потому что это количество их общее количество : N(NH3)=0,2*4*6,02*10^23= 4,816*10^23(атомов)
Happy Birthday! Happy Birthday to you! Happy Birthday! Happy Birthday to you!
Well it's time to celebrate your birthday, It happens every year. We'll eat a lot of broccoli, and drink a lot of beer. You should be good and happy that there's somethin' you can eat. A million people every day are starvin' in the street. Your daddy's in the gutter with the wretched and the poor. Your mama's in the kitchen with a can of Cycle Four. There's garbage in the water, There's poison in the sky. I guess it won't be long before we're all gonna die!
Happy Birthday! Happy Birthday to you! Happy Birthday! Happy Birthday to you!
Well, what's the matter, little friend, you think this party is the pits? Enjoy it while you can. We'll soon be blown to bits! The monkeys in the Pentagon are gonna cook our goose. Their finger's on the button, all they need is an excuse. It doesn't take a military genius to see We'll all be Crispy Critters after World War III. There's nowhere you can run to, Nowhere you can hide. When they drop the big one, We all get fried.
Come on, boys and girls, sing along, okay?
Happy Birthday! Happy Birthday to you! Happy Birthday! Happy Birthday to you!
Well, there's a punk in the alley, and he's lookin' for a fight. There's an Arab on the corner buyin' everything in sight. There's a mother in the ghetto with another mouth to feed. Seems that everywhere you look today, there's misery and greed. I guess you know the Earth is gonna crash into the sun, But that's no reason why we shouldn't have a little fun. So if you think it's scary, if it's more than you can take, Just blow out the candles, And have a piece of cake.
Happy Birthday! Happy Birthday to you! Happy Birthday! Happy Birthday to you!
(wow!)
Happy Birthday! Happy Birthday to you! Happy Birthday! Happy Birthday to you!
m(Me) : m(Br) = Mэ(Me) : Mэ(Br); Мэ(Br)=Ar/B=80/1=80г\моль.
4 : 16 = Mэ(Me) : 80
Mэ(Me)=20г/моль;
M(Me)=Mэ(Me)*B=20*2=40г/моль
ответ: кальций.