How many moles of Cag(PO4)2 are in 1.00 g of Ca(POA)2?
(Use whole molar masses from periodic table and choose closest calculated answer)
The molar mass of Ca(PO4)2 is:
Ca: 1 x 40.08 g/mol = 40.08 g/mol
P: 2 x 30.97 g/mol = 61.94 g/mol
O: 8 x 15.99 g/mol = 127.92 g/mol
Total: 229.94 g/mol
To find the number of moles in 1.00 g, we can use the formula:
moles = mass / molar mass
moles = 1.00 g / 229.94 g/mol
moles ≈ 0.00435
Therefore, there are approximately 0.00435 moles of Ca(PO4)2 in 1.00 g.
Which of the following compounds has dipole-dipole intermolecular forces?
All polar molecules have dipole-dipole intermolecular forces.
A polar molecule is one that has a permanent dipole moment or a separation of positive and negative charges within the molecule due to differences in electronegativity between atoms.
Therefore, any compound that has a polar bond or an asymmetrical molecular shape will have dipole-dipole intermolecular forces.
Examples of polar compounds that have dipole-dipole intermolecular forces include:
- HCl
- NH3
- CH3Cl
- CH2O
On the other hand, nonpolar compounds such as diatomic molecules (H2, N2, O2, etc.), noble gases, and symmetrical molecules like CO2, have only weak London dispersion forces as their intermolecular force.
To find the number of moles of Ca(PO4)2 in 1.00 g of the compound, you need to use the molar mass of Ca(PO4)2 and the formula:
1. Start by calculating the molar mass of Ca(PO4)2.
- The molar mass of Ca is 40.08 g/mol.
- The molar mass of P is 30.97 g/mol.
- The molar mass of O is 16.00 g/mol.
Ca(PO4)2 consists of 1 calcium atom (Ca), 2 phosphate groups (PO4), each consisting of 1 phosphorus atom (P) and 4 oxygen atoms (O).
Molar mass of Ca(PO4)2 = (1 * molar mass of Ca) + (2 * molar mass of PO4)
= (1 * 40.08 g/mol) + (2 * [(1 * molar mass of P) + (4 * molar mass of O)])
= (1 * 40.08 g/mol) + (2 * [(1 * 30.97 g/mol) + (4 * 16.00 g/mol)])
2. Calculate the molar mass of Ca(PO4)2 using the values from step 1.
3. Use the molar mass to convert grams to moles.
- Moles = Mass (in grams) / Molar mass
Moles of Ca(PO4)2 = 1.00 g / Molar mass (in g/mol)
Now you can substitute the calculated molar mass of Ca(PO4)2 into the above formula to find the number of moles.