Mass Percent Calculate the mass percent of Calcium Chloride in each of the following solutions
a) 5.00g of CaCl2 in 95.0 g of water
b) 1.00g of Calcium Chloride in 19.0 g of water
c) 15.0 g of Calcium Chloride in 285 g of water
d) 2.0 mg of CaCl2 in 0.0380 g of water
Part 2
Calculate the mass in grams of NaCl present in each of the following solutions
a) 11.5 g of 6.25% NaCl solution
b) 6.25 g of 11.5 % Nacl solution
c) 54.3 g of 0.91% NaCl solution
d) 452 g of 12.3% NaCl solution

"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"

the answer is 1 i believe

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).