The compound K2O2 also exists. A chemist can determine the mass of K in a sample of known mass that consists of either pure K2O or pure K2O2 . From this information, can the chemist answer the question of which compound is in the sample? Indicate yes or no, and explain.
Answers
Answer:
Yes the chemist can determine which compound is in the sample.
The molar mass of
K
2
O
is 94.2 g/mol.
The molar mass of
K
2
O
2
is 110.196 g/mol.
The molar masses are determined by adding the mass of each individual atom where the mass of 1 K atom is 39.0983 g/mol and 1 O atom is 15.999 g/mol.
If the mass of a pure compound is known, the mass of the potassium (K) can be subtracted from the total mass in order to determine the mass of oxygen (O). Both compounds above have two K atoms so the difference in the mass of oxygen can be used to determine the identity of the pure compound.
For example, after the mass of the K is subtracted from the unknown compound, then the remaining mass if the compound is
K
2
O
will be around 16 g and if the remaining mass is around 32 g then the compound is
K
2
O
2
.
Explanation:
hope it helps you
Yes, the chemist can answer the question of which compound is in the sample.
The molar mass of K2O is 94.2 g/mol
The molar mass of K2O2 is 110.196 g/mol
The molar masses are determined by adding the mass of each atom where the mass of 1 K atom is 39.0983 g/mol and 1 O atom is 15.999 g/mol.
If the mass of a pure compound is known, the mass of potassium (K) can be subtracted from the total mass to determine the mass of oxygen (O). Both compounds above have two K atoms so the difference in the mass of oxygen can be used to determine the identity of the pure compound.
For example, after the mass of the K is subtracted from the unknown compound, then the remaining mass if the compound is K2O will be around 16 g and if the remaining mass is around 32 g then the compound is K2O2