Atmospheric pressure yesterday was given as 0.875 atm. express this pressure in units of torr and also in kilopascals (kpa), respectively.

a) 665 torr and 8.87 × 104 kpa
b) 665 torr and 88.7 kpa
c) 1.32 × 10−3 torr and 9.87 × 10−3 kpa
d) 869 torr and 88.7 kpa

"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"

increased stability in the completion of fluorine's outer shell.