Answer: The percentage by mass of carbon in the given compound is 45.8 %
Explanation:
We are given a chemical compound having chemical formula
To calculate the percentage composition of an element in a compound, we use the equation:
In 1 mole of given compound, 10 moles of carbon atoms are there.
Mass of
Mass of carbon element =
Putting values in above equation, we get:
Hence, percentage of carbon in given compound is 45.8 %.
b. Water is a polar molecule.
c. The strong surface tension of water allows it to adhere to the sides of a container and actually move up tubing via capillary action.
d. Water cannot be found in other places in the universe.
b. beta particle.
c. alpha particle.
d. helium isotope.
b. good recovery sources.
c. sodium-poor.
d. highly concentrated
C. Sodium Poor - I took the test and got it correct
There are approximately of silver in the 100 mL silver bar.
To determine the number of atoms in a silver bar, you can follow these steps:
Calculate the mass of the silver bar:
Mass (g) = Volume (mL) x Density (g/mL)
Mass = 100 mL x 10.5 g/mL = 1050 g
Calculate the molar mass of silver (Ag):
The molar mass of silver (Ag) is approximately 107.87 g/mol.
Calculate the number of moles of silver in the bar:
Moles = Mass (g) / Molar Mass (g/mol)
Moles = 1050 g / 107.87 g/mol ≈ 9.73 moles
Calculate Avogadro's number:
Avogadro's number is approximately
Calculate the number of silver atoms in the bar:
Number of atoms = Moles x Avogadro's number
Number of atoms =
Thus, there are approximately of silver in the 100 mL silver bar.
For more such questions on silver:
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B)61.05 kJ
C)63.09 kJ
D)68.60 kJ
Energy released from changing the phase of a substance from the gas phase to liquid phase can be calculated by using the specific latent heat of vaporization. The heat of fusion of water at 0 degrees Celsius is 40.7 kJ/mol. Calculation are as follows:
Energy = 27.9 g (1 mol / 18.02 g) x 40.7 kJ/mol
Energy = 63.09 kJ
Answer:
C- 63.09 kJ
Explanation:
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