83.9 is the answer i’m pretty sure
Answer:
The answer to your question is below
Explanation:
a)
Number of atoms = ?
moles of Fe = 4.75
-Use proportions to solve this problem
1 mol of Fe --------------------- 6.023 x 10²³ atoms
4.75 moles --------------------- x
x = (4.75 x 6.023 x 10²³) / 1
x = 2.86 x 10²⁴ / 1
Number of atoms = 2.86 x 10²⁴
b)
Number of moles = ?
moles of 1.058 moles of H₂O
I think this question is incorrect, maybe you wish to know the number of atoms or grams of H₂O.
c)
Number of atoms = ?
moles of Fe = 0.759
1 mol of Fe ------------------ 6.023 x 10²³ atoms
0.759 moles --------------- x
x = (0.759 x 6.023 x 10²³) / 1
x = 4.57 x 10²³ / 1
Number of atoms of Fe = 4.57 x 10²³ atoms
d)
Number of molecules = ?
moles of H₂O = 3.5 moles
1 mol of H₂O ------------------ 6.023 x 10²³ molecules
3.5 moles ------------------ x
x = (3.5 x 6.023 x 10²³) / 1
x = 2.11 x 10²⁴ molecules
Number of molecules = 2.11 x 10²⁴
Answer:
burning of wood is an irreversible change bcoz wood after burning wood converted to ashes cannot be converted back to wood nd its chemical composition also changes
Answer:
The volumen of hydrogen (H) is 11.22 L
Explanation:
The balanced reaction between the aluminum (Al) and the hydrochloric acid (HCl) is:
2Al(s) + 6HCl(l) --> 2AlCl3(ac) + 3H2(g)
It is a reduction-oxidation reaction.
At the beginning we have 9.00 grams of Al what represents an certain amount of moles. Then, we know the molar mass of Al is 26.9815 g/mol, so the moles content in 9.00 g of Al are :
9.00 g Al * (1 mol Al / 26.9815 g Al)= 0.33356 mol Al
Now, we have to conisdered the molar relation between the Al and H2, according to the balanced reaction performed above. That is 2:3 (Al:H2)
Then,
0.33356 mol Al * (3 mol H2/ 2mol Al) = 0.50034 mol H2
In this point, we can considered the H2 like a noble gas, because the question ask for standard temperature and pressure (0° C= 273.15K and 1 atm).
Let us remember the noble gases equation
PV=nRT
P: pressure
V: Volumen
n: number of moles
R: gases constant
T: temperature
For the volumen, the equation is:
V= (nRT/P)
Now: V= (0.50034 mol * 0.0821 (L*atm/K*mol) * 273.15 K)/ (1 atm)
V= 11.22 L
Answer:
bio diesel
Explanation:
bio diesel is a recent development to supplement fossil fuels
