An aqueous solution of nitric acid contains 70.0 % hno3 by mass. the density of hno3 is 1.42 (g/cm3). express the mass percent of hno3 in molarity.

The mass percent of a solution which contains 70% of HNO₃ in molarity is 15.78 M.

Let the mass of the solution be 100 g. Thus, 70% of HNO₃ in the solution will be 70 g.

Mass of HNO₃ =  70 g

Molar mass of HNO₃ = 1 + 14 + (16×3) = 63 g/mol

Mole = mass / molar mass

Mole of HNO₃ = 70 / 63

Mass of solution = 100 g

Density of solution = 1.42 g/cm³

Volume = mass / density

Volume of solution = 100 / 1.42

Mole of HNO₃ = 1.111 mole

Volume of solution = 70.42 cm³ = 70.42 / 1000 = 0.07042 L

Molarity = mole / Volume

Molarity of HNO₃ = 1.111 / 0.07042

Therefore, the mass percent of HNO₃ in molarity is 15.78 M.

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[HNO₃] = 15.7 M

Explanation:

70% HNO₃ by mass, means that in 100 g of solution, we have 70 g of solute(in this case our solute is the HNO₃)

Let's determine the volume of solution, by density.

Solution density = Solution mass / Solution volume

1.42 g/mL = 100 g / Solution volume

100 g / 1.42 g/mL = Solution volume  →  70.4 mL

This is the volume occupied by the 70 grams of solute.

Molarity is: moles of solute / L of solution

Let's convert the mass to moles like this:

70 g / 63 g/m = 1.11 moles

Let's convert the volume from mL to L

70.4 mL / 1000 = 0.0704L

M = mol/L → 1.11 mol / 0.0704L = 15.7 M

the answer is a and have a great day

the term hydride is commonly named after binary compounds that hydrogen forms with other elements of the periodic table. hydride compounds in general form with almost any element, except a few noble gases. the trends and properties vary according to the type of intermolecular force that bonds the elements together, the temperature, its molecular masses, and other components. hydrides are classified into three major groups, depending on what elements the hydrogen bonds to. the three major groups are covalent, ionic, and metallic hydrides. formally, hydride is known as the negative ion of a hydrogen, h-, also called a hydride ion. because of this negative charge, hydrides have reducing, or basic properties. its special characteristics will be further discussed.

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