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Chimie

 
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PiKaCHu^

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Status: Offline
(since 02-07-2015 15:08)
Joined: 18 May 2014
Posts: 1289, Topics: 46
Location: zmx.freakz.ro

Reputation: -87.1
Votes: 81

     
Post Posted: 22-10-2014, 15:34:28 | Translate post to: ... (Click for more languages)

Salut am nevoie de cineva care ma poate ajuta sa inteleg si eu.
Am ca tema urmatoarele probleme:
Calculeaza masa de apa care se obtine din reactia de ardere a 2 grame de hidrogen.
Eu am notat mh2o= ?
m h2= 2g
Am calculat masa moleculara a lui h2o=18
Masa moleculara h2=2.
Aici intotdeauna ma incurc
Ce tip de reactie este? De COMBINARE,DESCOMPUNERE sau de INLOCUIRE? Cine ma poate ajuta sa inteleg cand este reactia de descompunere si de inlocuire:|?
O alta problema
100 kg carbune de contitunul 60% carbon se ard in exces de oxigen rezultand dioxid de carbon?
Determina cantitatea de gaz rezultat in Kg si in kmoli.
Aici masa impura=100 kg
puritate= 60%
deci masa pura = 60 supra 100 x 100 =60 kg.
Si de aici din nou aceiasi intrebare: Ce fel de reactie ?
Va rog ajutati-ma !


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BoGdanCoFcd

[Doar Dinamo]



Status: Offline
(since 24-09-2019 18:10)
Joined: 28 Jul 2014
Posts: 3969, Topics: 775
Location: Poarta Alba

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Post Posted: 22-10-2014, 20:51:56 | Translate post to: ... (Click for more languages)

Prima de combinare iar a doua de inlocuire , te sfatuiesc sa intrebi profesorul cum se afla....as scrie un roman.
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