Can someone help me with this chemistry problems? (Mole)?

Question

3. What is the mass of one (1) mole of carbon dioxide, CO2?
4. What is the mass of one (1) mole of sulfuric acid, H2SO4?

Find the number of moles in each quantity
5) 3.00 g H2SO4
6) 12.0 CH4
7) 3.40 X 10-1 g CaO
8) 13.4 g SO2

Find the mass of each substance

9) 0.369 mol N2
10) 10.0 mol Ca(NO3)2
11) 1.94 x 10-3mol C6H12O6
12) 0.0112 mol KCl


Convert between moles and particles. Particles can be atoms, ions, or molecules.
Calculate how many particles are in the following and place the answers in the work
assignment. Don't forget to use Avogadro's number!
13) 25.9 mol Fe
14) 0.30 mol NaCl 2

Calculate the number of moles in each of the following and place the answers in the work
assignment.
15) 47 x 1023 atoms Cu 1
6) 8.30 x 1025 molecules H2O



I dont understand these I have plenty more to do but I jus need help with these for right now can someone help me with a few?

Answer 1

Instead of asking others to solve your homework for you please solve yourself.
UNDERSTAND THESE CONCEPT FIRST.
a) 1 mole of any element\compound will contain Avagadro's no of atoms\molecules = 6.02215 * 10^23

b)1mol of compound = the molecular weight of compound corresponding to that many grams
E.g. 12 g of Carbon is 1 mol of carbon
Since 12 is the atomic weight of carbon

Use these atomic weights:
H=1 , C=12 , S=32 , O=16 , N=14 , K=39 , Ca=40
Check the answers:
3) 12+2*16=44 gram

4) 1*2+32+16*4= 98 gram

5) 3/98=0.0306 mols

6) 12/16= 0.75 mols

7) 0.34/40=0.0085 mols

8) 13.4/64 = 0.209375 mols

9) 10.332 grams

10) 2100 grams

11)0.3492 grams

12)8.344 grams

13) 1.559*10^25 atoms

14) 1.8066*10^23

15) 7.8 mols

6) 137.824 mols

Answer 2

a mole is kind of an approximation and has (approximately 6.022×1023) entities. A mole is much like "a dozen".
The mole is useful in chemistry because it allows different substances to be measured in a comparable way. Using the same number of moles of two substances, both amounts have the same number of molecules or atoms. The mole makes it easier to interpret chemical equations in practical terms. Thus the equation:

2H2 + O2 → 2H2O
In this example, moles are used to calculate the mass of CO2 given off when 1 g of ethane is burnt. The equation for this chemical reaction is:

7 O2 + 2 C2H6 → 4 CO2 + 6 H2O

Do some more studding, it sounds like the teacher wants you to know the weights or how to find counts of chemicals.

Answer 3

Remeber one mole of any atom is equal to atomic mass and one mole of any molecule is equal to its molecular mass.
formula of mole is :

Mole = Mass in gram / Molecular mass

3. 1 mole CO2 = 44 gm where C =12 and O =16
CO2 = 12 + 16x2
12 + 32
44
[H=1, S=32, O = 16]
4. 1 mole H2SO4 = 2x 1 + 1x 32 + 4x16
2+32+64
98
To calculate number of particles or avogadro's number the formuila is very simple

Number of particles = Mole x 6.02 x 10 ^ 23


use this formula to find the values , sorry i m very much otherwise i can send the solution of all the question, you can send me e-mail if you need further assistance

Answer 4

Use the atomic masses for each element:
H=1, S=32, O=16, C=12

Therefore:
3. 44g
4. 98g

5. 3/98~0.0306g
6. 12/16=0.75g
7. 0.34/56~0.006g
8. 13.4/64=0.209375g

9. 0.369*28=10.332g
10. 10*164=1640g
11. 0.00194*192=0.37248g
12. 0.0112*74.5=0.8344g

13. ~166*10^23 atoms
14. 1.8069*10^23 molecules
15. ~7.8 mol
16. ~137.8 mol H2O

Hope that helps ^.^

Answer 5

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Answer 6

For #3,4
the mass of 1 mole of a compound (molecular mass or formula mass) is found by adding up the individual atomic masses of the elements in the compound (look on a periodic chart)
(multiply by the subscripts)

example:
molecular mass of CO2 = mass of C + (2 x mass O)

For #5,6,7,8
To change grams to moles you divide by the molecular mass

For #9,1,0,11,12
To change moles to grams you multiply by the molecular mass

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a "mole" is just a word for a really big number (like "dozen" is a word for 12). That number is 6.022 x 10^23 and it is called Avogardro's number.

For #13,14
To convert moles to number of particles you would multiply by 6.022 x 10^23

For #15,16
To convert number of particles to moles you divide by 6.022 x 10^23.

Answer 7

2Fe(NO3)3 + 3K2SO4 --> Fe2(SO4)3 + 6KNO3 So after its stability 1ml = a million cubic cm locate the mole of K2SO4 mol = M * ml (cm3) be conscious: covert ml to L, M = mol/L = 2.75mol/L * 0.05L = 0.138mol next covert 0.138mol of K2SO4 to Fe(NO3)3 with the help of the coefficient 0/138 mol K2SO4 * 2 mol Fe(NO3)3 / 3 mol K2SO4 = 0.0917 mol of Fe(NO3)3 covert mol to mass mass = g/mol * mol 0.0917 mol * 241.9 g/mol = 22.2 g =)