MOLE CONVERSIONS 1. How many H2O molecules are in 183.2 grams of H2O gas?
2. How much space (L) does 3.614 x 1026 molecules of H2O2 take up?
3. How many molecules are in 3492.5 grams of Mg3(PO4)2?
4. How many grams does 60.2 L of Al(NO3)3 weigh?
5. How many Nmolecules are in 473.2 grams of N ?
6. How many grams does 80.34 L of Hz weigh?
7. How many grams are in 5.39 x 1025 molecules of
Al(OH),?
Stoichiometry and Balancing Chemical Equations
Balance the following chemical reactions
8. _H2 + _N2 => _NH3
9. _58 + _O2 => _SO
10. _Ni(CIO)2 → _NICI + O2
11 _C₂H4
_02 > CO2
H2O
12 _KCIO
_КСІ
0
13 Cu(OH)2 + __HC H302
Cu(C2H2O2)2
14. CH8 + __0
CO H20
+
+
+
_H20
15. 76.2 Liters of O2 gas reacts with an excess of Cat STP. How many grams of
CO will be produced?
2C + O2 -> 200
Due in less than 5 minutes

1.    6.116x1024 Molecules of H2O

2.    13400 L

3.    8.001x1024 Molecules of Mg3(PO4)2

4.    572 g.

5.    1.017x1025 Molecules of N2

6.    7.24 g

.7.     6980 g. of Al(OH)3

8.    3H2 + N2    => 2NH3

9.    S8 + 8O2   => 8SO2

10.  Ni(ClO3)2→     NiCl2   +  3O2

11.  C2H4      +      3O2→      2CO2      +     2H2O

12.  2KClO3→      2KCl      +      3O2

13.  Cu(OH)2   +   2HC2H3O2→     Cu(C2H3O2)2      +     2H2O

14.  C3H8      +      5O2→      3CO2      +      4H2O

15.  191 g of CO

when 25.0 ml of 0.700 mol/l naoh was mixed in a calorimeter with 25.0 ml of 0.700 mol/l hcl, both initially at 20.0 °c, the temperature increased to 22.1 °c. the heat capacity of the calorimeter is 279 j/°c.

the equation for the reaction is:

naoh + hcl → nacl + h₂o

moles of hcl = 0.0250 l hcl ×

0.700

mol hcl

1 l hcl = 0.0175 mol hcl

volume of solution = (25.0 + 25.0) ml = 50.0 ml

mass of solution = 50.0 ml soln ×

1.00

ml soln

= 50.0 g soln

δt=t2-t1

= (22.1 – 20.0) °c = 2.1 °c

the heats involved are

heat from neutralization + heat to warm solution + heat to warm calorimeter = 0

q1+q2+q3=0

nδh+mcδt+cδt=0

0.0175 mol ×

δh

+ 50.0 g × 4.184 j·g⁻¹°c⁻¹ × 2.1 °c + 279 j°c⁻¹ × 2.1 °c = 0

0.0175 mol ×

δh

+ 439.32 j + 585.9 j = 0

0.0175 mol ×

δh

= -1025.22 j

δh=1025.22j0.0175 mol= -58 600 j/mol = -58.6 kj/mol

a polar bond is formed when electrons are shared unevenly between atoms