Carry out the following conversions: (a) 32.4 yd to centimeters, (b) 3.0 x 10^10 cm/s to ft/s, (c) 1.42 light-years to miles (a light-year is an astronomical measure of distanceâthe distance traveled by light in a year, or 365 days; the speed of light is 3.00 x 10^8 m/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"