A 0.821 sample of a substance composed of diatomic molecules has a mass of 131.3g. Identify this molecule.
May I have your expert help with this question? Thank you.
.821 what?
I'm sorry...it's a 0.821-mol sample of a substance.....
Thank you
Please help me with this question.
Give the formula for calcium phosphate and then answer the following questions:
(a)Calculate the percent composition of each of the elements in this compound.
(b)If you knew that there was 50.0g of phosphorus in your sample,how many grams of calcium phosphate would you have? How many moles of calcium phosphate would this be? How many formula units of calcium phosphate?
Of course! I'd be happy to help you with this question.
To identify the molecule, we need to determine its molar mass and then analyze the given information.
1. Convert the mass of the sample to moles: We can do this by dividing the given mass (131.3g) by the molar mass of the substance.
Molar mass = mass / moles
2. Calculate the number of moles: Divide the mass of the sample (131.3g) by the molar mass of the substance.
3. Determine the empirical formula: Divide each element's subscripts (found in the empirical formula) by the lowest number of moles calculated in the previous step.
4. Calculate the number of moles for each element in the empirical formula: Multiply the stoichiometric coefficients from the empirical formula by the lowest number of moles calculated in step 3.
5. Determine the molar mass of the empirical formula: Multiply the molar mass of each element by their stoichiometric coefficients in the empirical formula and add them up.
Now, if you can provide the empirical formula, or at least the elemental composition of the substance, we can proceed to calculate its molar mass.