1. If 16g of oxygen contains 1 mole of oxygen atoms, calculate the mass of one atom of oxygen.
2. How many moles of Calcium Carbonate are present in 10g of the substance?
Q. 2.CONVERT MOLES INTO NUMBER OF ATOMS / MOLECULES:
1. Calculate the number of atoms in 0.2 moles of Sodium.
2. What is the number of molecules in 0.25 moles of oxygen.
3. Calculate the mass of a) 0.5 mole of Silver b) 0.5 mole of Sugar ( C12H22O11)
4. What is the number of molecules in 1.5 moles of Ammonia?
5. What are the two things that a mole represents?
Q. 3. CONVERT NUMBER OF ATOMS INTO MOLES OR GRAMS:
1. How many moles are there in 9.033 x 1024 atoms of Helium?
2. Calculate the number of moles in12.044 x1025 atoms of Phosphorus.
3. Calculate the mass of 3.011 x 1024 molecules of Nitrogen gas?
4. How many grams of Neon will have same number of atoms as 4 grams of Calcium?
5. Calculate the mass of a) an atom of Copper b) a molecule of Carbon dioxide ( atomic mass of Cu=63.5)
Q. 5. CONVERT GRAMS INTO NUMBER OF ATOMS / MOLECULES:
1. What is the number of Zinc atoms in a Zinc piece weighing 10g?
2. How many grams of Magnesium will have the same number of atoms of as 6 grams of Carbon.
3. The mass of one molecule of a substance is 11.79 x 10-26 kg. What is its molar mass?
4. How many atoms are present in one gram atomic mass of a substance? How many molecules are present in one gram molecular mass of a substance?
5. Calculate the ratio of molecules present in 4.4g of CO2 and 1.6 g of SO2
6. If one mole of Nitrogen molecules weigh 28g, calculate the mass of one molecule of Nitrogen in grams.
7. The absolute mass of one molecule of a substance is 5.32 x 10-23 g. What is its molecular mass ? What could this substance be?
8.
a. How many atoms are there in exactly 12g of carbon-12?
b. What name is given to this number?
c. What name is given to the amount of substance containing this number of atoms?
9. The mass of one atom of an element X is 2 x 10-23 g
d. Calculate the atomic mass of element X.
e. What could element X be?
Pls answer wat u can really fast
Dear Student,
1. The mass of 1 atom = Gram atomic mass of atom/ 6.022 × 1023
So, the mass of 1 atom of oxygen = Gram atomic mass of oxygen atom/ 6.022 × 1023
= 16g/ 6.022 × 1023
= 2.66 × 10-23 g
Due to time constraint, it would not be possible for us to provide the answers to all your queries. We are some trick to solve rest questions. Try solving rest of the questions yourself and if you face any difficulty then do get back to us.
Let use an idea to solve this and your other questions
- First learn the mole concept table as
| Mole Relationship | 1 Mole | 6.022 × 1023 | 22.4 L at STP | Gram Atomic Mass-GAM | Gram Molecular Mass-GMM |
| Categories | No of moles | No of particles | Volume | Mass | mass |
- Use the follwing calculation box
| To find | Given data in question |
| Reapective value from mole concept table | Reapective value from mole concept table |
Now solve the Ist question again.
- Let the mass of 1 oxygen atom = X g (put this into the To find of calculation box) i.e. we want to find mass.
- So, reapective value from mole concept table is mass i.e GAM which is 16g. (put this into the below of To find of calculation box)
- Given no of atom is 1. (put this into the Given data in question of calculation box). It is no. of particle.
- So, reapective value from mole concept table is no. of particles i.e. 6.022 × 1023 (put this into the below of Given data in question of calculation box).
Let the mass of 1 atom of oxygen = X g
| To find = Xg | Given data in question= 1 |
| Reapective value from mole concept table = GAM=16 | Reapective value from mole concept table= 6.022 × 1023 |
so, X/16 = 1/ 6.022 × 1023
X = 1×16 / 6.022 × 1023
= 2.66 × 10-23 g
Hence, the mass of 1 atom of oxygen = 2.66 × 10-23 g
Hope! This would help you.