One example of rocket fuel is the reaction of hydrazine with dinitrogen tetroxide.
2N2H4(1) + N204(9) - 3N2(g) + 4H2O(g) + heat
->
This reaction is hypergolic, meaning it does not need an external ignition
source, and highly exothermic. 1.000 liter of hydrazine is reacted with
excess dinitrogen tetroxide. The density of hydrazine is 1.021 g/mL, and
the molar mass is 32.0452 g/mol.
How many moles of water could be produced?
lol Hz

"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"

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

all eukaryotic cell have mitochondria : )