There are 1.50 x10^6 atoms of nitrogen in 10 grams of NH4NO3. You convert the grams to moles first and then using the definition of a mole you determine the number of molecules.

Three compounds containing potassium and oxygen are compared. Analysis shows that for each 1.00 g of O, the compounds have 1.22
The law of proportion expresses that components join in entire number proportions. The gram readings for K are products of each other, both in grams and moles. Give us a chance to think about the proportions: 2.44 grams/1.22 grams = 2 4.89 grams/2.44 grams = 2 Accordingly, Potassium dependably consolidates with Oxygen in a proportion of 2 is to 1.

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Calculate the volume of hydrogen needed to saturate the double bonds in 100 g of linoleic acid (RMM = 280).

15.99 dm³


The molecular formula of Linoleic acid is C₁₈H₃₂O₂. As shown in attached figure, the Linoleic acid contains two double bonds hence we can say that in the Hydrogenation reaction of Linoleic acid 2 mole of H₂ are added across the two double bonds to make it saturated (Stearic acid).

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The balance chemical equation for the hydrogenation of Linoleic acid is as follow:

C₁₈H₃₂O₂ + 2 H₂ → C₁₈H₃₆O₂

Calculating moles of Linoleic acid:

Moles = Mass / M/Mass

Moles = 100 g / 280 g/mol

Moles = 0.357 moles Linoleic acid

Calculating moles of Hydrogen:

According to equation:

1 mole C₁₈H₃₂O₂ required = 2 moles of H₂


0.357 moles Linoleic acid will require = X moles of H₂

Solving for X,

X = 2 moles × 0.357 moles / 1 mole

X = 0.714 moles of H

Calculating volume of Hydrogen Gas:

Let us assume that the volume is calculated at standart temperature (273.15 K) and pressure (1 atm). We know that STP,

1 mole of gas occupies = 22.4 dm³ of volume


0.714 moles of gas will occupy = X dm³ of volume

Solving for X,

X = 22.4 dm³ × 0.714 moles / 1 mole

X = 15.99 dm³

Note: As the is not 17.28 dm³ so it means that the conditions for gas like temperature and pressure are different and are not mentioned in statement. Hence, if the conditions are known then one can use ideal gas equation i.e. PV=nRT to solve for volume.