calculate the formula mass of sodium carbonate decahydrate. (PROPER ANSWER).
Answers
Answer:
286 u
Explanation:
Chemical formula of Sodium Carbonate Decahydrate is:
Formula unit mass of Sodium: 23 u
Formula unit mass of Hydrogen: 1 u
Formula unit mass of Carbon: 12 u
Formula unit mass of Oxygen: 16 u
Total formula unit mass of = C(1) + H(20) + Na(2) + O(13)
=(12 x 1) + (1 x 20) + (23 x 2) + (16 x 13)
= 12 + 20 + 46 + 208
= 286 u
Answer:The formula mass of sodium carbonate decahydrate,
Na
2
CO
3
⋅
10H
2
O
, is
286 u
.
Explanation:
Calculate formula mass of
Na
2
CO
3
⋅
10
H
2
O
.
Multiply the subscript of each element by its relative atomic mass,
A
r
, on the periodic table. No subscript is understood to be
1
. In the case of
10H
2
O
, you will need to also multiply by the coefficient
10
. I'm going to round the
A
r
for each element to a whole number. Your instructor may want you to use more digits.
(
2
×
23 u Na
)
+
(
1
×
12 u C
)
+
(
3
×
16 u O
)
+
(
10
×
2
×
1 u H
)
+
(
10
×
1
×
16 u O
)
=
286 u Na
2
CO
3
⋅
10
H
2
O
If the molar mass is required, it is numerically equal to the formula mass in g/mole.