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4 years ago

In order to change grams of a substance to moles of the same substance, or vice versa, the following should be used:

Chemistry

2 answers:

Cerrena [4.2K]4 years ago

5 0

The answer would be C) molar mass

Inga [223]4 years ago

4 0

Answer:

C) molar mass

Explanation:

Hello,

In the calculations in chemistry, one of the major computations involve the conversion from mass to mole considering that there is no equipment that allows us to measure the exact moles of a substance since it depends on the type of atom, in spite of this fact, balances have been widely used to measure a substance's mass. In such a way, it is possible to relate them via the molar mass since it relates how many grams of a substance are contained in one mole of such substance. For instance, one mole of sodium chloride has 58.44 grams of sodium chloride or vice versa, so its molar mass is $58.44 g/mol$ .

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How many molecules of n2 are in a 200.0 ml container at 780 mmhg and 135∘c?

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By use of ideal gas equation PV= nRT where n is the number of moles,P = pressure, V = volume, R= gas constant (0.08206 L. atm/ mol.k) ant T is the temperature,

to calculate the number of moles(n) =PV/RT

convert ml to L, that is 200/1000= 0.2 L

convert mmHg to atm, that is 780mm hg x 1atm/ 760 mm hg= 1.026 atm

convert temperature to kelvin, that is 135 +273= 408 k
n is therefore= (0.2 x 1.026)/ ( 0.08206 x 408)= 6.129 x10^-3 moles

from avogadro constant 1moles = 6.02 x10^23 molecules what about 6 .129 x10^-3 moles

= ( 6.02 x10^23) x (6.129 x10^-3)/ 1mole = 3.69 x10^21 molecules

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