Given, `2Fe+(3)/(2)O_(2)toFe_(2)O_(3),DeltaH=-193.4kJ,Mg+(1)/(2)O_(2)to MgO,DeltaH=-140.2kJ` What is the `DeltaH` for the following reaction? `3Mg+Fe_

Question

Given, `2Fe+(3)/(2)O_(2)toFe_(2)O_(3),DeltaH=-193.4kJ,Mg+(1)/(2)O_(2)to MgO,DeltaH=-140.2kJ` What is the `DeltaH` for the following reaction? `3Mg+Fe_

Given, `2Fe+(3)/(2)O_(2)toFe_(2)O_(3),DeltaH=-193.4kJ,Mg+(1)/(2)O_(2)to MgO,DeltaH=-140.2kJ`
What is the `DeltaH` for the following reaction?
`3Mg+Fe_(2)O_(3) to 3MgO+2Fe`
A. `-227.2kJ`
B. `-272.3kJ`
C. `227.2kJ`
D. `272.3kJ`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - A
`2Fe+(3)/(2)O_(2)toFe_(2)O_(3),DeltaH=-193.4kJ` . . (i)
`Mg+(1)/(2)O_(2)toMgO,DeltaH=-140.2kJ` . .. (ii)
On multiplying Eq. (iI) by (3) and subtracting eq. (i) we get the final equation,
`3Mg+Fe_(2)O_(3)to2Fe+3MgO,`
`therefore DeltaH=(-420.6)+(193.4)=-227.2kJ`

4 views Answered 2023-02-05 15:29