Answer:
* 
* 
* 
Explanation:
Hello,
In this case, for the mole fraction of methanol we use the formula:

Thus, we compute the moles of both water (molar mass 18 g/mol) and methanol (molar mass 32 g/mol):

Hence, mole fraction is:

Next, mass percent is:

And the molality, considering the mass of water in kg (0.185 kg):

Regards.
Bonjour,
it’s cobalt(III) sulfate
1 mole contains 6.023 *10^23 molecules
Answer:
The present age of the Sun is 4.6 billion years old. It will live for about 5.4 billion years more. Initially, the Sun was majorly composed of Hydrogen. Current composition of the Sun is 70% hydrogen, 28% Helium and 2% heavier elements. Thus, the composition has changed since birth due to nuclear fusion process in the core.