Can someone please help me I’m being timed and need help with 2 questions
1. Calculate the mass of oxygen in 418g of Co2
2. Calculate the number of atoms in 7.38 moles of carbon atoms
Of course! I'll be happy to help you with these questions.
1. To calculate the mass of oxygen in 418g of CO2, we need to determine the percent composition of oxygen in CO2 and then apply it to the total mass.
CO2 is composed of one carbon atom (C) and two oxygen atoms (O). The molar mass of CO2 is 44.01 g/mol. To find the mass of oxygen, we need to determine its percent composition.
The molar mass of oxygen (O) is 16.00 g/mol.
The percent composition of oxygen in CO2 would be:
[(2 x molar mass of O) / molar mass of CO2] x 100
= [(2 x 16.00 g/mol) / 44.01 g/mol] x 100
= 72.73%
Now, we can calculate the mass of oxygen in 418g of CO2:
Mass of oxygen = Percent composition of oxygen x Total mass of CO2
= 72.73% x 418g
= 304.3 g
Therefore, the mass of oxygen in 418g of CO2 is approximately 304.3 g.
2. To calculate the number of atoms in 7.38 moles of carbon atoms, we will use Avogadro's number.
Avogadro's number, 6.022 x 10^23, represents the number of atoms in one mole of an element.
To find the number of atoms in 7.38 moles of carbon (C):
Number of atoms = Number of moles x Avogadro's number
= 7.38 moles x (6.022 x 10^23 atoms/mol)
= 4.44 x 10^24 atoms
Therefore, there are approximately 4.44 x 10^24 atoms in 7.38 moles of carbon atoms.
I hope this helps! If you have any further questions, feel free to ask.
mass O2 = 418 g CO2 = 418 x (molar mass O2/molar mass CO2) = ?
1 mol C contains 6.02E23 atoms C; so how many atoms will be in 7.38 mols?