How does GPS help predict volcanic eruptions? The ground swells slightly before an eruption. GPS devices can detect the swelling.
GPS satellites can see into the cone of the volcano.

The magma carries a GPS device as it travels. Scientists can track the flow of magma by adding more GPS devices to magma.

GPS devices can detect when gases leave a volcano before an eruption.

"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"

confused

confused             hewdejdnjnjsnd

28528289 29823282 8298232 39858

i think that the answer is c