Using the atomic masses and relative abundance of the isotopes of nitrogen given below, determine the average atomic mass of nitrogen. N-14: 14.003 amu; 99.63% N-15: 15.000 amu; 0.37%
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mass of isotope A * % of isotope A + mass of isotope B * % of isotope B + ....
Now,
Here,
Average atomic mass of nitrogen = (14.003 * 99.63%) + (15.000 * 0.37%)
= (14.003 * 0.9963) + ( 15.000 * 0.0037)
= 13.951 + 0.056
= 14.007 a.m.u.
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Given: V1= 3.9L V2= 4.13L T1= 299K P1=763mmHg P2=720mmHg
Unknown: T2=?
Formula: T2=T1P2V2 / P1V1
Solution: T2= (299K)(720mmHg)(4.13L) / (763mmHg)(3.9L)
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B. The number of electrons ranges from 1 to 3.
C. The number of neutrons ranges from 0 to 2.
D. The number of protons ranges from 0 to 2.
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The correct answer is C.
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Considering the definition of molar mass, the number of moles of chlorine present in 140 grams of chlorine gas is 1.975 moles.
Definition of molar mass
The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Number of moles present in 140 g of Cl₂
Next, you can apply the following rule of three: If by definition of molar mass 70.9 grams are contained in 1 mole of Cl₂, 140 grams of the gas are contained in how many moles?
amount of moles= 1.975 moles
Finally, the number of moles of chlorine present in 140 grams of chlorine gas is 1.975 moles.
Learn more about molar mass:
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