Chemistry, 26.12.2020 08:00 fsdfsf

A hydrated sample of cobalt II chloride has a molar mass of 309.99 g/mol. What is the mole ratio between cobalt II chloride and water?

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Answer from: noahook84

Explanation:

Let there be 1 mole of CoCl2.

Mass of CoCl2 = 1mol * (129.839g/mol) = 129.839g

Mass of H2O = 309.99g - 129.839g = 180.151g

Moles of H2O = 180.151g / (18g/mol) = 10mol

Hence the mole ratio of CoCl2 to H2O is 1 : 10.

Answer from: aleily74

$\boxed {\boxed {\sf 1 \ mole \ CoCl_2 \ to \ 10 \ mole \ H_2O}}$

Explanation:

First, identify the formula of cobalt II chloride: CoCl₂

Next, find the molar mass of CoCl₂. Identify the individual element's mass.

Cobalt (Co): 58.93319 g/molChlorine (Cl): 35.45 g/mol

Since there is a subscript of 2 after the Cl, we must multiply the molar mass of chlorine by 2

CoCl₂: (58.93319 g/mol) + (2* 35.45 g/mol) = (58.93319 g/mol)+(70.9 g/mol) 129.83319 g/mol

Assuming the sample is 1 mole, we can subtract the mass we just found from the hydrate sample's mass. This is the mass of the water.

309.99 g - 129.83319 g= 180.15681 g

Now, we need to find the number of moles of water. Begin by finding the molar mass of water: H₂O

Hydrogen (H): 1.008 g/mol Oxygen (O): 15.999 g/mol

Since there is a subscript of 2 after the H, we must multiply the molar mass of hydrogen by 2.

H₂O: (1.008 g/mol *2)+ 15.999 g/mol = (2.016 g/mol)+(15.999 g/mol)=18.006 g/mol

Finally, divide the mass of the water by the molar mass of water.

180.15681 g / 18.006 g/mol

Note that the grams or g will cancel.

180.15681 / 18.006 mol = 10.00537654 mol

This is roughly 10, so we can round to 10.

≈ 10 mol H₂O

So, the mole ratio is 1 mole CoCl₂ to 10 mole H₂O

Answer from: Quest

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Answer from: Quest

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A hydrated sample of cobalt II chloride has a molar mass of 309.99 g/mol. What is the mole ratio bet...

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