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Flashcards in mole_conversions Deck (18):
1

Define the mole.

The mole is the amount of matter equivalent to what is contained in an Avogadro number of carbon-12 atoms.

2

What conversion factor is needed to convert the number of neodymium atoms to the amount of neodymium atoms (in moles)?

To convert the number of neodymium atoms to the amount of neodymium atoms (in moles) one needs to multiply by 1 mole Nd atoms/6.022x1023 Nd atoms.

3

What conversion factor is needed to convert the amount of chlorine molecules (Cl2) in moles to the number of chlorine molecules?

To convert the amount of chlorine molecules (Cl2) in moles to the number of chlorine molecules one needs to multiply by 6.022x1023 Cl2 molecules/1 mole Cl2 molecules.

4

What conversion factor is needed to convert the amount of chlorine molecules (Cl2) in moles to the number of chlorine atoms?

To convert the amount of chlorine molecules (Cl2) in moles to the number of chlorine atoms one needs to multiply by 6.022x1023 Cl2 molecules/1 mole Cl2 molecules x 2 Cl atoms/ 1 Cl2 molecule.

5

Which molecule has a greater molar mass: H2O or H2O2?

H2O2 clearly has a greater molar mass as its molecular formula has one additional oxygen atoms per molecule.

6

Which has a greater amount of molecules in moles: one gram of H2O or one gram of H2O2?

One gram of H2O has a greater amount of molecules. This is because the amount is calculated by dividing the mass by the molar mass. Because the molar mass of H2O is smaller, one gram will correspond to a greater amount (in moles). This can also be shown by calculation 1 g/18.02 g/mol = 0.055 mol vs 1 g/34.02 g/mol = 0.029 mol.

7

Which has a greater number of molecules: one gram of H2O or one gram of H2O2?

One gram of H2O has a greater number of molecules. This is because the number of molecules is calculated by dividing the mass by the molar mass and then multiplying by Avogadro's number. Because the molar mass of H2O is smaller, one gram will correspond to a greater amount.

8

Which has more oxygen atoms: one gram of H2O or one gram of H2O2?

H2O2 has more oxygen atoms. Although there is a greater amount of H2O (1 g/18.02 g/mol = 0.055 mol vs 1 g/34.02 g/mol = 0.029 mol) than H2O2, there are 2 mol of oxygen atoms for every 1 mol of H2O2 molecules, therefore a total 0.059 mol of oxygen atoms. For water, because there are 1 mol of oxygen atoms for every 1 mol of H2O molecules, there are 0.055 mol of oxygen atoms.

9

Which has more hydrogen atoms: one gram of H2O or one gram of H2O2?

H2O has more hydrogen atoms. There is a greater amount of H2O molecules than H2O2 molecules for one gram of each coompound (1 g/18.02 g/mol = 0.055 mol vs 1 g/34.02 g/mol = 0.029 mol) and given that both compounds have 2 mol of hydrogen atoms per 1 mol of compound, H2O has more hydrogen atoms.

10

Which molecule has a greater molar mass: N2O or N2O4?

N2O4 clearly has a greater molar mass as its molecular formula has three additional oxygen atoms per molecule.

11

Which has a greater amount of molecules in moles: one gram of N2O or one gram of N2O4?

One gram of N2O has a greater amount of molecules. This is because the amount is calculated by dividing the mass by the molar mass. Because the molar mass of N2O is smaller, one gram will correspond to a greater amount (in moles).

12

Which has a greater number of molecules: one gram of N2O or one gram of N2O4?

One gram of N2O has a greater number of molecules. This is because the number of molecules is calculated by dividing the mass by the molar mass and then multiplying by Avogadro's number. Because the molar mass of N2O is smaller, one gram will correspond to a greater amount.

13

Which has more oxygen atoms: one gram of N2O or one gram of N2O4?

N2O4 has more oxygen atoms. Although there is a greater amount of N2O (1 g/44.01 g/mol = 0.023 mol vs 1 g/92.01 g/mol = 0.011 mol) than N2O4, there are 4 mol of oxygen atoms for every 1 mol of N2O4 molecules, therefore a total 0.044 mol of oxygen atoms. For N2O, because there are 1 mol of oxygen atoms for every 1 mol of N2O molecules, there are 0.023 mol of oxygen atoms.

14

Which has more nitrogen atoms: one gram of N2O or one gram of N2O4?

N2O has more nitrogen atoms. There is a greater amount of N2O molecules than N2O4 molecules for one gram of each coompound (1 g/44.01 g/mol = 0.023 mol vs 1 g/92.01 g/mol = 0.011 mol) and given that both compounds have 2 mol of nitrogen atoms per 1 mol of compound, N2O has more nitrogen atoms.

15

What conversion factor(s) is(are) needed to convert number of acetone (C3H6O) molecules to mass of acetone in grams?

To convert number of acetone (C3H6O) molecules to mass of acetone in grams one needs to multiply by 1mol/6.022x1023 C3H6O molecles x 58.08 g/mol (molar mass of acetone).

16

What conversion factor(s) is(are) needed to convert number of acetone (C3H6O) molecules to number of hydrogen atoms?

To convert number of acetone (C3H6O) molecules to number of hydrogen atoms one needs to multiply by 6 H atoms /1 molecule C3H6O.

17

What conversion factor(s) is(are) needed to convert amount of acetone (C3H6O) molecules (in moles) to amount of hydrogen atoms (in moles)?

To convert amount of acetone (C3H6O) molecules (in moles) to amount of hydrogen atoms (in moles) one needs to multiply by 6 mol H atoms /1 mol C3H6O molecules.

18

Amount of matter equivalent to what is contained in an Avogadro number of carbon-12 atoms.

The mole