Consider the reaction below:
cu(no3)2 + koh -> cu(oh)2 + kno3

heat energy reaction= -54.992 kj

-balance the reaction, then:
1. find what mass of koh is consumed when 4.85 kj of heat is absorbed.
2. the density of cu(no3)2 is 4.8546298500775293 g/l. what will be the mass of cu(oh)2 produced from 35.0 ml of this solution?
3. in the reaction of 3.00 g of each reactant, what is the mass of kno3 produced?

show the stoichiometry equations you set up. !

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.