When iron (Fe) reacts with molecular oxygen (O2), a new compound is formed. This compound is the Fe2O3 found in rust. 4 Fe + 3 O2 → 2 Fe2O3

If 112 g of Fe combines with 48 g of O2, how much Fe2O3 is formed?
A. 48 g Fe2O3
B. 112 g Fe2O3
C. 88 g Fe2O3
D. 160 g Fe2O3

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the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied

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explanation:

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