(a) Determine the mass of calcium metal that contains the...

(a) Determine the mass of calcium metal that contains the same number of moles as $89.6 \mathrm{~g}$ of zinc metal. (b) Calculate the number of moles of molecular fluorine that has the same mass as 36.9 moles of argon. (c) What is the mass of sulfuric acid that contains 0.56 mole of oxygen atoms? (d) Determine the number of moles of phosphoric acid that contains $2.12 \mathrm{~g}$ of hydrogen atoms.

(a) Determine the mass of calcium metal that contains the same number of moles as $89.6 \mathrm{~g}$ of zinc metal.
(b) Calculate the number of moles of molecular fluorine that has the same mass as 36.9 moles of argon.
(c) What is the mass of sulfuric acid that contains 0.56 mole of oxygen atoms?
(d) Determine the number of moles of phosphoric acid that contains $2.12 \mathrm{~g}$ of hydrogen atoms.

Key Concepts

Mole Concept

The mole is a fundamental unit in chemistry that quantifies the amount of a substance. It serves as a bridge between the atomic scale and the macroscopic scale, allowing chemists to count atoms and molecules by relating them to a standard number (Avogadro's number, approximately 6.022 x 10^23 entities per mole). This concept is essential for converting between the number of particles and the measurable mass of substances.

Molar Mass

Molar mass is the mass of one mole of a substance, usually expressed in grams per mole. It is calculated by summing the atomic masses of all atoms present in the chemical formula of a compound. This concept is crucial when converting between the mass of a substance and the number of moles, as it provides a direct scaling factor for these conversions.

Stoichiometric Ratios

Stoichiometric ratios are derived from the balanced chemical formulas of compounds and reactions. They indicate the proportion of moles of each element or compound involved in a chemical reaction or present in a compound. Understanding these ratios is key to determining how many moles of one substance correspond to a given number of moles or mass of another substance.

Mass-to-Mole Conversion

Mass-to-mole conversion is a fundamental calculation in chemistry that involves using the molar mass to convert a measured mass of a substance to the corresponding number of moles. This technique underpins many stoichiometric calculations, enabling the determination of how much of a reactant or product is present based on its mass.

Transcript

00:02 Given information for part a we have the mass of zinc is mass of zinc is equal to 80.

00:26 89 .6 gram and we have to find we have to find the mass of calcium metal that contains the mass of calcium metal that contains the the same number of moles is given amount of zinc metal.

01:21 So the number of moles of zinc is number of moles of zinc is equal to given mass of zinc divided by molar mass of zinc is equal to 89 .6 grams is the given mass of zinc and molar mass is 65 .38 gram per mole is equal to 1 .37 mole so number of moles of zinc is 1 .37 mole and number of mules of zinc is 1 .37 mole and number of of zinc is equal to number of moles of calcium is equal to 1 .37 mole so therefore the mass of calcium is mass of calcium is equal to number of moles of calcium into molar mass of calcium is equal to 1 .37 mole into molar mass of calcium is 40 .78 gram per mole is equal to 54 .92 gram is the mass of calcium.

03:50 And given information for part b, we have the number of moles of malls of malls.

04:03 Of argon number of moles of organ is equal to 36 .9 mole so we have to calculate the number of moles of molecular fluorine that contains the same mass is given amount of organ so so the mass of argon is equal to number of moles of argon into molar mass of argon is equal to 36 .9 mole into molar mass of organ is 39 .48 gram per mole.

06:03 The calculated mass of argon is 1 .4.

06:14 74 .08 gram.

06:22 So mass of organ is equal to mass of fluorine, molecular fluorine is equal to 14774 .08 gram.

06:48 Therefore, the number of moles of molecular floring fluorine is number of moles of molecular fluorine is equal to mass of fluorine, molecular fluorine divided by 2 into molar mass of fluorine is equal to given mass of molecular fluorine is .08 gram divided by molecular mass of fluorine is 2 into 18.

07:44 998 gram per mole is equal to 38 .80 mall is the calculated mol of molecular fluorine...

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