Atoms of different elements also have different average masses, just like kernel

Question

Atoms of different elements also have different average masses, just like kernels and marbles. Use the mass values from a periodic table to answer the following questions. Please use the precision of the values in the periodic table link to determine the correct number of significant figures for your answer.

(a) What is the relative mass of one atom of B to one atom of N?

= _____________  

(b) What is the relative mass of one mole of B to one mole of N?

= _____________  

(c) What is the relative mass of 1.9 moles of Mg to 1.9 moles of Pd?

= ________________

MUST USE THE CORRECT NUMBER OF SIGNIFICANT FIGURES!!!!!!!!!!!!!!!!!!!!!!!!!!!

Explanation / Answer

a)

Relative atomic mass of B = 10.008

Relative atomic mass of N = 14.007

This means 10.008 B contains 6.02 X 1023 atoms and

14.007 N contains 6.02 X 1023 atoms

Relative atomic mass of one atom of B = 10.008/6.02 X 1023

Relative atomic mass of one atom of N = 14.007/6.02 X 1023

So the relative mass of one atom of B to one atom of N = (10.008/6.02 X 1023) / (14.007/6.02 X 1023)

10.008/14.007 = 0.7145 = 7.145 X 10-1

b)

The relative mass of one mole of B = 10.008

The relative mass of one mole of N = 14.007

So the relative mass of one mole of B to one mole of N = 10.008/14.007 = 0.7145 = 7.145 X 10-1

c)

Relative atomic mass of Mg = 24.305

Relative atomic mass of Pd = 106.420

The relative mass of 1.9 moles of Mg = 1.9 X 24.035

The relative mass of 1.9 moles of Pd = 1.9 X 106.420

Therefore the relative mass of 1.9 moles of Mg to 1.9 moles of Pd = (1.9 X 24.035) / (1.9 X 106.420)=

24.035 / 106.420 = 0.2259 = 2.259 X 10-1

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.