For the reaction 2Na + 2H20 - 2NaOH + H2 how many grams of sodium hydroxide are produced from 2.21 mol of water?
Select one:
O a. 88.6
Ob. 177
O c. 44.3
O d. 55.4

Explanation:

Moles of sodium

=

130

⋅

g

22.99

⋅

g

⋅

m

o

l

−

1

=

5.65

⋅

m

o

l

.

Now you have the stoichiometric equation:

2

N

a

(

s

)

+

2

H

2

O

(

l

)

→

2

N

a

O

H

(

a

q

)

+

H

2

(

g

)

↑

⏐

If there are

5.65

⋅

m

o

l

of metal, clearly

5.65

⋅

m

o

l

2

dihydrogen gas are evolved, i.e.

2.83

⋅

m

o

l

H

2

. Typically, in a question like this, you would also be asked to calculate the volume the gas occupies under standard conditions, and the

p

H

of the resultant solution (would it be high, low, neutral?).

false

because it does not have the potential to be entirely used up

b) nuclear ive learned that in a pedtrodic table