1.1.How many moles of calcium (Ca) atoms are in 74.0 g of Ca? 1 moles 2.What is

Question

1.1.How many moles of calcium (Ca) atoms are in 74.0 g of Ca?
1 moles

2.What is the mass in grams of a single atom of each of thefollowing elements? (a) Zn
1 g
(b) Os
2 g

3.Calculate the molar mass of a compound if 0.462 mole of it has a mass of 143 g.
1 g/mol

4.Calculate the number of C, H, and O atoms in 2.00 g of glucose(C6H12O6), a sugar.
C atoms
1
O atoms
2
H atoms
3

5.rust is represented by fe2O3. how many moles of Fe are presentedin 29.9g of the compound?




(a) Zn
1 g
(b) Os
2 g

3.Calculate the molar mass of a compound if 0.462 mole of it has a mass of 143 g.
1 g/mol

4.Calculate the number of C, H, and O atoms in 2.00 g of glucose(C6H12O6), a sugar.
C atoms
1
O atoms
2
H atoms
3

5.rust is represented by fe2O3. how many moles of Fe are presentedin 29.9g of the compound?

Explanation / Answer

For the first question, all you need to do is divide thegrams by the molar mass: 74g Ca x [ 1mol Ca ] = 1.85molCa                40.08g Ca For the second question, you just need to remember thatmoles and atoms are the same thing (1 mole and atom =6.02x1023)   a) [65.39g Zn] x 1atm = 65.39g Zn         1atm    b) [190.23g Os] x 1atm =190.23g Os             1atm For the thirsd question, remember that to find the molarmass, you dived the number of grams by the moles(M=m/n): 3) [ 143g ] = 309.5g/molcompound      0.462mol The trick to 4, is that the number of atoms of eachelement is the subscript number following: C = 6atm H = 12atm O = 6atm Hope this helps!!
-PilsnerPrincess Hope this helps!!
-PilsnerPrincess

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