Answer:
1.48×10²⁴ Cu atoms
Explanation:
For this question you need to use Avogadro's number 6.022×10²³atoms.
2.45 moles of Cu ×= 1.47539×10²⁴ atoms.
The moles cancel out so you are left with atoms.
Since there are 3 significant figures in the question there should be 3 significant figures in your answer, which is 1.48×10²⁴ Cu atoms.
Answer: The molecular formula for the given organic compound X is
Explanation:
We are given:
Mass of
Mass of
We know that:
Molar mass of carbon dioxide = 44 g/mol
Molar mass of water = 18 g/mol
For calculating the mass of carbon:
In 44g of carbon dioxide, 12 g of carbon is contained.
So, in 4.13 g of carbon dioxide, = of carbon will be contained.
For calculating the mass of hydrogen:
In 18g of water, 2 g of hydrogen is contained.
So, in 1.13 g of water, of hydrogen will be contained.
Mass of oxygen in the compound = (3.00) - (1.13+ 0.125) = 1.75 g
To formulate the empirical formula, we need to follow some steps:
Step 1: Converting the given masses into moles.
Moles of Carbon =
Moles of Hydrogen =
Moles of Oxygen =
Step 2: Calculating the mole ratio of the given elements.
For the mole ratio, we divide each value of the moles by the smallest number of moles
For Carbon =
For Hydrogen =
For Oxygen =
Step 3: Taking the mole ratio as their subscripts.
The ratio of C : H : O = 1: 1.33: 1.16
Converting them into whole number ratios by multiplying by 6:
The ratio of C : H : O = 6: 8: 7
Hence, the empirical formula for the given compound is
Empirical mass =
The equation used to calculate the valency is :
Putting values in above equation, we get:
Multiplying this valency by the subscript of every element of empirical formula, we get:
Thus molecular formula for the given organic compound X is