Is this compatible with the 27" iMacs with the quad-core Intel i5 processor?

I looking at purchasing a refurbished iMac, but want to upgrage the memory. Is this the right module to purchase to add 4GB to the computer? Is it easy to install.

Apple Memory Module 4GB 1333MHz DDR3 (PC3-10600) - 2x2GB

Apple Memory Module 4GB 1333MHz DDR3 (PC3-10600) - 2x2GB

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