I need help with this lab.
Write the equation for the decomposition of the hydrate, CuSO4*XH2O.
Mass of crucible and hydrate: 93.000g
Mass of crucible and pure salt: 91.196g
I need to calculate the following:
1. mass of water in hydrate sample(g)
2. number of moles of water in the sample
3. mass of pure salt in the sample(g)
4. number of moles of salt in the sample
5. molar ratio of water to salt in the sample
From your calculations what is the empirical formula of copper sulfate hydrate?
You don't have enough information here.
1. mass H2O = 93.000-91.196 = ?
2. mols H2O = grams H2O/molar mass H2O
3. mass pure salt = 91.196-mass crucible = ?
4. mols salt = grams/molar mass CuSO4
5. Find the mols H2O to 1 mol CuSO4.
This all that I have, what other information do I need?
never mind I got it thanks!
To calculate the values you need, follow these steps:
1. Calculate the mass of water in the hydrate sample. This can be done by subtracting the mass of the crucible and pure salt from the mass of the crucible and hydrate:
Mass of water in hydrate sample = Mass of crucible and hydrate - Mass of crucible and pure salt
2. Calculate the number of moles of water in the sample. To do this, divide the mass of water by the molar mass of water (18.015 g/mol):
Number of moles of water = Mass of water in hydrate sample / Molar mass of water
3. Calculate the mass of pure salt in the sample. This can be obtained by subtracting the mass of water from the mass of the hydrate sample:
Mass of pure salt in sample = Mass of crucible and hydrate - Mass of water in hydrate sample
4. Calculate the number of moles of salt in the sample. To do this, divide the mass of salt by its molar mass. The molar mass of copper sulfate (CuSO4) can be calculated using the periodic table:
Molar mass of salt = (Atomic mass of Cu) + (Atomic mass of S) + (4 * Atomic mass of O)
Number of moles of salt = Mass of pure salt in sample / Molar mass of salt
5. Finally, calculate the molar ratio of water to salt in the sample by dividing the number of moles of water by the number of moles of salt. This ratio will give you the empirical formula:
Molar ratio of water to salt = Number of moles of water / Number of moles of salt
Based on these calculations, you can determine the empirical formula of copper sulfate hydrate. The empirical formula represents the simplest whole number ratio of elements in a compound. Divide the subscripts of each element by the smallest value to simplify. For example, if the molar ratio is 1:2:3, divide by 1 to get the ratio of 1:2:3.