The haber process can be used to produce ammonia (nh3) from hydrogen gas (h2) and nitrogen gas (n2). the balanced equation for this process is shown below.
3h2 + n2 mc025-1.jpg 2nh3
the molar mass of nh3 is 17.03 g/mol. the molar mass of h2 is 2.0158 g/mol. in a particular reaction, 0.575 g of nh3 forms. what is the mass, in grams, of h2 that must have reacted, to the correct number of significant figures?
0.1
0.102
0.10209
0.1021

Answer : The mass of in grams is 0.102g.

Solution : Given,

Molar mass of = 17.03 g/mole

Molar mass of = 2.0158 g/mole

Given Mass of = 0.575 g

First we have to calculate the moles of .

= = 0.0337 moles

The given balanced equation is,

From the above reaction, we conclude that

2 moles of produced from 3 moles of

then the 0.0337 moles of produces to give moles of

The moles of = 0.0505 moles

The mass of = Moles of × Molar mass of = 0.0505 moles × 2.0158 g/mole = 0.10179 g

The mass of in the correct number of significant figures is 0.102 g.

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