According to newtons second law of motion, if a force remains the same but mass increases, then acceleration

The acceleration of an object increases with increased force and decreases with increased mass. The law also states that the direction in which an object accelerates is the same as the direction of the force.

http://www.classzone.com/vpg_ebooks/ml_sci_gr8/accessibility/ml_sci_gr8/page_50.pdf

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the maximum mass of nh3 is nh3 in grams