Answer:
The answer to your question is 27 g of Al
Explanation:
Data
mass of Al = ?
moles of Al₂O₃ = 0.5
The correct formula for the product is Al₂O₃
Balanced chemical reaction
4Al + 3O₂ ⇒ 2Al₂O₃
Process
1.- Calculate the molar mass of the product
Al₂O₃ = (27 x 2) + (16 x 3)
= 54 + 48
= 102 g
2.- Convert the moles of Al₂O₃ to grams
102 g ---------------- 1 mol
x ---------------- 0.5 moles
x = (0.5 x 102) / 1
x = 51 g of Al₂O₃
3.- Use proportions to calculate the mass of Al
4(27) g of Al --------------- 2(102) g of Al₂O₃
x --------------- 51 g
x = (51 x 4(27)) / 2(102)
x = 5508 / 204
x = 27 g of Al
Answer:
4.3moles contains 2.08×10(to the power of)24 atoms.
the relationship between atoms and moles
1mole atoms=6.022×10(to the power of)23
4.3mol×6.022×10
Answer:
here are the answers !
Explanation:
1) the land surface cools quicker than the water surface at night. So the best Answer would be D
2) I think this answer would be True because When a fluid such as air or water touches a hot object, it can heat up and then move in bulk as a fluid, thereby carrying the heat quickly to new locations. Hot air rising is a common example of heat convection.
3) Wind is the movement of air from areas of high pressure to areas of low pressure.
The mole fraction of urea in a solution that contain 2.1 mol Urea and 4.4 mole of water is 0.32
calculation
mole fraction = moles of urea/ total mole
moles of urea = 2.1 mole
calculate the total mole
= 2.1 mole + 4.4 mole = 6.5
Mole fraction is therefore = 2.1/.6.5 = 0.32
Answer:
As the frequency increases, the wavelength decreases. ... (a) For a given sound, as the temperature increases, what happens to the frequency? There is no change in frequency. The speed of sound increases by about 0.5 m/s for each degree Celsius when the air temperature rises.