The space shuttle endeavor is launched to an altitude of 400,000 m above the surface of the earth. the shuttle travels at an average rate of 750 m/s. how long will it take for endeavor to reach its orbit?
question 4 options:

0.53 s

533.3 s

300,000 s

400,000 s

"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"

l dont know l am s sorry