An arctic weather balloon is filled with 34.8L of helium gas inside a prep shed. The temperature is inside the shed is11 . C The balloon is then taken outside, where the temperature is -40 c . Calculate the new volume of the balloon. You may assume the pressure on the balloon stays constant at exactly 1 atm . Round your answer to significant 3 digits.

first one is the correct answer

"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"