2205J
Explanation:
Given parameters:
Mass of object = 75kg
height = 8m
Unknown:
Potential energy gained = ?
Solution:
Potential energy is the energy due to rest of a body. It derived using the expression below:
P.E = mgh
where m is the mass
g is the acceleration due to gravity()9.8m/s²)
h is the height
P.E = 75 x 9.8 x 3 = 2205J
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Potential energy brainly.com/question/10770261
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Answer:
Mass = 23.95 g
Explanation:
Mass of iron = 16.7 g
Mass of iron(iii) oxide formed = ?
Solution:
Chemical equation:
Fe + 3O₂ → 2Fe₂O₃
Number of moles of iron:
Number of moles = mas/ molar mass
Number of moles = 16.7 g/ 55.85 g/mol
Number of moles = 0.3 mol
Now we will compare the moles of iron and iron oxide.
Fe : Fe₂O₃
4 : 2
0.3 : 2/4×0.3 = 0.15 mol
Mass of iron(iii) oxide:
Mass = number of moles × molar mass
Mass = 0.15 mol × 159.69 g/mol
Mass = 23.95 g
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