How many hydrogen molecules are in a tank that has 0.76 moles of hydrogen molecu
ID: 575357 • Letter: H
Question
How many hydrogen molecules are in a tank that has 0.76 moles of hydrogen molecules? 8. How many atoms of potassium make up 2.00 moles? 9. How many molecules of water make up 1.52 mole? 10. How many moles are in 2.43 x 104 sodium atoms? 11. How many moles are in 9.26 x 1023 water molecules? 12. How many molecules of water make up 1.15 moles of water? 13. How many moles of hydrogen atoms are in 1.00 mole of water? 14. How many moles of carbon atoms are present in 2.53 moles of methane (CH)? 15. How many hydrogen atoms are in a tank that has 0.76 moles of hydrogen molecules?Explanation / Answer
7. One mole contains 6.023 x 1023 (Avogadro number)particles.
0.76 moles contain = 0.76 x 6.023 x 1023 = 4.58 x 1023 hydrogen molecules
8. 1 mole potassium atoms contain 6.023 x 1023 atoms. 2 moles contain = 2 x 6.023 x 1023 = 12.046 x 1023 potassium atoms.
9. Number of molecules that make up 1.52 mole = 1.52 x 6.023 x 1023 = 9.15 x 1023 molecules of water
10. 1 mole sodium atoms = 6.023 x 1023.
Number of moles of sodium atoms = 2.43 x 1024 / 6.023 x 1023 = 4.0 moles
11. number of moles of water molecules = 9.26 x 1023 / 6.023 x 1023 = 1.54 moles.
12. Number of molecules that make up 1.15 mol water = 1.15 x 6.023 x 1023 = 6.93 x 1023 molecules
13. 1 mole of water, H2O has 6.023 x 1023 water molecules. But 1 molecule of water has 2 hydrogen atoms. So number of hydrogen atoms in 1 mol water = 12.046 x 1023
14. Number of methane molecules in 2.53 mol methane = 2.53 x 6.023 x 1023 = 15.24 x 1023 molecules
One molecule of methane, CH4 has one atom of carbon, so number of carbon atoms = 15.24 x 1023.
15. number of hydrogen molecule in 0.76 mol = 6.023 x 1023 x 0.76 = 4.58 x 1023 molecules.
But hydrogen molecule, H2 has two hydrogen atoms, so number of hydrogen atoms = 2 x 4.58 x 6.023 x 1023 = 9.16 x 1023 .
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