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aleksandrvk [35]
4 years ago
11

Why do some chemical reactions occur?

Chemistry
1 answer:
zheka24 [161]4 years ago
7 0

Answer:

Explanation:

Reactions occur when two or more molecules interact and the molecules change. Bonds between atoms are broken and created to form new molecules

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Who developed the initial model of the atom but didn’t know about subatomic particles
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3 years ago
If 300.0 grams of FeCr2O7 react, how many grams of O2 will be consumed
kvv77 [185]
You are given 300 grams of FeCr2O7. You are required to get the mass of O2 in grams. The first thing to do is to find a reaction between FeCr2O7 and O2. The balanced chemical reaction is 2Fe + 6Cr + 21/2O2 -> Fe2(Cr2O7)3. The molar mass of Fe2(Cr2O7)3 is 759.65 grams per mole and 32 grams per mole for O2.  
<span>
300g Fe2(Cr2O7)3 (1 mol Fe2(Cr2O7)3/759.65 g Fe2(Cr2O7)3)(21/2 mol O2/1 mole Fe2(Cr2O7)3)(32 g O2/1 mole O2) = <u>132.7 g O2</u></span>
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