PLZ HELP 30 points chemical reaction | controlled variable | independant V | dependant V
iron and copper (II) | | |
sulfate solution | | |
| | |
Lead (II) nitrate and | | |
potassium iodide | | |
solutions | | |
| | |
Magnesium metal | | |
and hydrochloric | | |
acid solution | | |
| | |
Electrolysis of water | | |
| | |
Burning magnesium | | |

these are the reactions i believe
1. 2Fe + 3CuSO4 →3Cu + Fe2(SO4)3
2. 2Pb(NO3)2+ 2Kl →2PbI + 2KNO3
3. Mg + 2HCl →MgCl2 + H2
4. H2O → H2 + O
5. 2Mg + 2O2 →2MgO2

i know insulin is primary but i dont know the others im sorry

explanation:

there all right good

explanation:

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

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