Based on intermolecular forces, which of these substances would have the highest boiling point?(1) He (3) CH4
(2) O2 (4) NH3

Final answer:

To find the number of atoms in 0.450 grams of P2O5, you need to calculate the number of moles of P2O5 and then use Avogadro's number to convert it to the number of atoms.

Explanation:

To determine the number of atoms in 0.450 grams of P2O5, we need to use the molar mass of P2O5. The molar mass of P2O5 is 141.94 g/mol. Using this information, we can calculate the number of moles of P2O5 in 0.450 grams by dividing the mass by the molar mass:

Moles of P2O5 = mass / molar mass = 0.450 g / 141.94 g/mol = 0.00317 mol

Next, we can use Avogadro's number to convert the moles of P2O5 into the number of atoms:

Number of atoms = moles x Avogadro's number = 0.00317 mol x 6.022 x 1023 atoms/mol = 1.91 x 1021 atoms

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Answer: b. ,

Explanation:

According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.

For the given chemical equation:

Here, is accepting a proton, thus it is considered as a base and after accepting a proton, it forms which is a conjugate acid.

And, is losing a proton, thus it is considered as an acid and after loosing a proton, it forms which is a conjugate base.

Hence, the correct answer is b. ,

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Answer: Ask them

Explanation:

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