Answer: for question 4, the answer would most likely be movement of air, water and rock
Explanation:
To calculate the empirical formula of a compound, we have to follow some steps:
Step 1: Calculate the number of moles of K and O.
For this we need to know the molar mass of K and O.
Molar mass of K=39.0983 g/mol
Molar mass of O=16 g/mol
Given mass of K= 32.3 g
Given mass of O= 6.61 g
Number of moles=Mass /molar mass
So, Number of moles of O=Mass /molar mass
=6.61/16
=0.41
Number of moles of K =Mass /molar mass
=32.3/39
=0.82
Step 2: Find the lowest number of moles and divide each element's moles by it:
Here the lowest number of moles are of oxygen(O) so dividing each element's moles by its mole number will give:
K =0.82/0.41
= 2
O = 0.41/0.41
= 1
So the empirical formula of the compound should be:
K₂O.
Less dense because there mainly gas
Answer:
It is letter B.
Explanation:
believe my answer cause I answered this kind of question in ny exam