Question

Please help with these 3 questions!!!

1) How many atoms are contained in 0.55 g of Ni?


2) How many moles of Ti are in 5.50 × 1024 atoms of Ti?


3) How many atoms are in 3 molecules of H2CO?

Answer 1

1) To determine the number of atoms in 0.55 g of Ni, we need to use the atomic mass of Ni and Avogadro's number.

The atomic mass of Ni is 58.69 g/mol.

We can use the following calculation to determine the number of atoms in 0.55 g of Ni:

0.55 g Ni x (1 mol Ni / 58.69 g Ni) x (6.022 x 10^23 atoms / 1 mol Ni) = 5.84 x 10^21 atoms of Ni

Therefore, there are 5.84 x 10^21 atoms of Ni in 0.55 g of Ni.

2) To determine the number of moles of Ti in 5.50 x 10^24 atoms of Ti, we need to use Avogadro's number and the atomic mass of Ti.

The atomic mass of Ti is 47.87 g/mol.

We can use the following calculation to determine the number of moles of Ti:

5.50 x 10^24 atoms Ti x (1 mol Ti / 6.022 x 10^23 atoms Ti) = 9.13 moles Ti

Therefore, there are 9.13 moles of Ti in 5.50 x 10^24 atoms of Ti.

3) To determine the number of atoms in 3 molecules of H2CO, we need to use the molecular formula of H2CO and Avogadro's number.

The molecular formula of H2CO tells us that each molecule contains 5 atoms (2 hydrogen atoms, 1 carbon atom, and 2 oxygen atoms).

We can use the following calculation to determine the number of atoms in 3 molecules of H2CO:

3 molecules of H2CO x 5 atoms / molecule = 15 atoms

Therefore, there are 15 atoms in 3 molecules of H2CO.

Answer 2

1. To determine the number of atoms in 0.55 g of Ni, we need to use the molar mass of Ni and Avogadro's number. The molar mass of Ni is 58.69 g/mol.

First, we need to find the number of moles of Ni in 0.55 g:

moles of Ni = mass of Ni / molar mass of Ni

moles of Ni = 0.55 g / 58.69 g/mol

moles of Ni = 0.009367 mol

Next, we can use Avogadro's number to convert from moles to atoms:

number of atoms = moles of Ni x Avogadro's number

number of atoms = 0.009367 mol x 6.022 x 10^23 atoms/mol

number of atoms = 5.63 x 10^21 atoms

Therefore, there are 5.63 x 10^21 atoms in 0.55 g of Ni.

2. To determine the number of moles of Ti in 5.50 x 10^24 atoms of Ti, we need to use Avogadro's number.

First, we need to convert the number of atoms to moles:

moles of Ti = number of atoms of Ti / Avogadro's number

moles of Ti = 5.50 x 10^24 atoms / 6.022 x 10^23 atoms/mol

moles of Ti = 9.13 moles

Therefore, there are 9.13 moles of Ti in 5.50 x 10^24 atoms of Ti.

3. To determine the number of atoms in 3 molecules of H2CO, we need to use the molecular formula of H2CO and Avogadro's number.

The molecular formula of H2CO indicates that there are 5 atoms in each molecule (2 hydrogen atoms, 1 carbon atom, and 2 oxygen atoms).

To determine the total number of atoms in 3 molecules of H2CO, we can multiply the number of atoms per molecule by the number of molecules:

total number of atoms = number of atoms per molecule x number of molecules

total number of atoms = 5 atoms/molecule x 3 molecules

total number of atoms = 15 atoms

Therefore, there are 15 atoms in 3 molecules of H2CO.