Using the same sample of gas (P1P1P_1 = 275 torrtorr , T1T1 = 36 ∘C∘C ), we wish to change the pressure to 2750 torrtorr with no accompanying change in volume or amount of gas. What temperature T2T2, in Celsius, is needed to reach this pressure?

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Q: How many molecules (not moles) of NH3 are produced from 3.78×10−4 g of H2?

A: Given :  Mass of H2 = 3.78 x 10-4 gm  Molar mass of H2 = 2 gm/mole   

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Q: HCl(aq) + NaOH(aq) – → _

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.