Calculate the number of atoms in each of the following.

A)1.50g potassium
B)0.470g of oxygen
C)0.555g of silver chlorate,AgCIO3
D)7.57 of platinum

please help i do not understand this

Determine moles, then remember that 1 mol contains 6.022E23 atoms/molecules.

A. 1.50 g K
moles K = 1.50/39.1 = 0.0384
1 mole contains 6.022E23 atoms; therefore, 0.0384 moles will contain 0.0384*6.022E23 atoms = ??

0.470 g oxygen
moles = 0.470/32 = 0.0147
#molecules = 0.0147*6.022E23 = ??
Since oxygen is diatomic (O2), it will contain 2x that for the number of atoms.

To calculate the number of atoms in a given substance, you can use the following steps:

Step 1: Determine the molar mass of the substance.
Step 2: Convert the given mass of the substance to moles.
Step 3: Use Avogadro's number to convert moles to atoms.

Let's calculate the number of atoms in each substance:

A) Potassium (K):
1. Find the molar mass of potassium (K) from the periodic table: 39.10 g/mol.
2. Convert the given mass of potassium (1.50g) to moles:
moles = mass / molar mass
moles = 1.50g / 39.10 g/mol ≈ 0.038 mol.
3. Use Avogadro's number, which is 6.022 x 10^23 atoms/mol, to convert moles to atoms:
number of atoms = moles x Avogadro's number
number of atoms = 0.038 mol x 6.022 x 10^23 atoms/mol ≈ 2.29 x 10^22 atoms.

Therefore, there are approximately 2.29 x 10^22 atoms in 1.50g of potassium.

B) Oxygen (O):
1. Find the molar mass of oxygen (O) from the periodic table: 16.00 g/mol.
2. Convert the given mass of oxygen (0.470g) to moles:
moles = mass / molar mass
moles = 0.470g / 16.00 g/mol ≈ 0.029 mol.
3. Use Avogadro's number to convert moles to atoms:
number of atoms = moles x Avogadro's number
number of atoms = 0.029 mol x 6.022 x 10^23 atoms/mol ≈ 1.75 x 10^22 atoms.

Therefore, there are approximately 1.75 x 10^22 atoms in 0.470g of oxygen.

C) Silver Chlorate (AgClO3):
1. Find the molar mass of silver chloride (AgClO3) from the periodic table:
Ag: 107.87 g/mol, Cl: 35.45 g/mol, O: 16.00 g/mol.
Molar mass = (Ag) + (Cl) + (3 x O)
= 107.87 g/mol + 35.45 g/mol + (3 x 16.00 g/mol)
≈ 165.32 g/mol.
2. Convert the given mass of silver chlorate (0.555g) to moles:
moles = mass / molar mass
moles = 0.555g / 165.32 g/mol ≈ 0.00336 mol.
3. Use Avogadro's number to convert moles to atoms:
number of atoms = moles x Avogadro's number
number of atoms = 0.00336 mol x 6.022 x 10^23 atoms/mol ≈ 2.02 x 10^21 atoms.

Therefore, there are approximately 2.02 x 10^21 atoms in 0.555g of silver chlorate.

D) Platinum (Pt):
1. Find the molar mass of platinum (Pt) from the periodic table: 195.08 g/mol.
2. Convert the given mass of platinum (7.57g) to moles:
moles = mass / molar mass
moles = 7.57g / 195.08 g/mol ≈ 0.039 mol.
3. Use Avogadro's number to convert moles to atoms:
number of atoms = moles x Avogadro's number
number of atoms = 0.039 mol x 6.022 x 10^23 atoms/mol ≈ 2.35 x 10^22 atoms.

Therefore, there are approximately 2.35 x 10^22 atoms in 7.57g of platinum.

Sure! I can help you with these calculations. To calculate the number of atoms in a given substance, we need to use the concept of moles and Avogadro's number.

Avogadro's number, denoted as "Na," is approximately 6.022 x 10^23. It represents the number of atoms, ions, or molecules in one mole of a substance.

To calculate the number of atoms, we need to follow these steps:
1. Convert the given mass to moles.
2. Calculate the number of moles.
3. Multiply the number of moles by Avogadro's number to get the number of atoms.

Now, let's solve each part of your question step-by-step:

A) 1.50g of potassium:
1. First, find the molar mass of potassium (K) from the periodic table. The molar mass of K is approximately 39.10 g/mol.
2. Convert the given mass to moles by dividing the mass by the molar mass:
Moles of potassium (K) = given mass / molar mass
= 1.50g / 39.10 g/mol
3. Now, calculate the number of atoms by multiplying the number of moles by Avogadro's number:
Number of atoms = moles of potassium (K) * Avogadro's number

B) 0.470g of oxygen:
1. Find the molar mass of oxygen (O) from the periodic table. The molar mass of O is approximately 16.00 g/mol.
2. Convert the given mass to moles:
Moles of oxygen (O) = given mass / molar mass
= 0.470g / 16.00 g/mol
3. Calculate the number of atoms by multiplying the number of moles by Avogadro's number.

C) 0.555g of silver chlorate (AgCIO3):
1. First, find the molar mass of silver chlorate (AgCIO3) by adding the molar masses of its individual elements. Ag: 107.87 g/mol, Cl: 35.45 g/mol, O: 16.00 g/mol.
2. Convert the given mass to moles:
Moles of silver chlorate (AgCIO3) = given mass / molar mass
= 0.555g / (107.87 + (35.45 * 3) + (16.00 * 3)) g/mol
3. Calculate the number of atoms by multiplying the number of moles by Avogadro's number.

D) 7.57g of platinum:
1. Find the molar mass of platinum (Pt) from the periodic table. The molar mass of Pt is approximately 195.08 g/mol.
2. Convert the given mass to moles:
Moles of platinum (Pt) = given mass / molar mass
= 7.57g / 195.08 g/mol
3. Calculate the number of atoms by multiplying the number of moles by Avogadro's number.

Perform these steps for each given substance, and you will find the number of atoms in each case.