4 Compare and contrast the reactants and products in the two combustion reactions below.
Balance the formulas to allow you to refer to the numbers of molecules of each
reactant and product in your answer.

Combustion of Methane

Methane (CH) + Oxygen
Carbon dioxide + Water

Combustion of Hydrogen

Hydrogen + Oxygen >
Water

methane + oxygen → carbon dioxide + water

Explanation:

methane + oxygen → carbon dioxide + water methane + oxygen → carbon dioxide + water methane + oxygen → carbon dioxide + water

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.

"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"