Question

Determine the number of potassium atoms in 1.803g of potassium
carbonate

Answer #1

**K2CO3 mass = 1.803 g**

**K2CO3 moles = Mass of K2CO3 / ( molar mass of
K2CO3)**

**
= (1.803 g) / ( 138.2 g/mol) = 0.013046**

**Number of K moles = Number of moles of K2CO3 x
2 ( since 1K2CO3
gives 2K)**

** =
0.013046 x 2 = 0.0260926**

**Number of K atoms = Number of moles of K x avagdro
number**

**
= 0.0260926 mol x 6.023
x10^23 ( where
avagadro number = 6.023 x 10^23)**

**
= 1.57 x 10^22**

How many grams of sodium contain the same number of atoms as
12.4 g of potassium? Using correct significant figures.

When aqueous solutions of potassium carbonate
and cobalt(II) bromide are combined, solid
cobalt(II) carbonate and a solution of
potassium bromide are formed. The net ionic
equation for this reaction is:

2.176 g of a solid mixture containing only potassium carbonate
(FW = 138.2058 g/mol) and potassium bicarbonate (FW = 100.1154
g/mol) is dissolved in distilled water. 30.06 mL of a 0.765 M HCl
standard solution is required to titrate the mixture to a
bromocresol green end point. Calculate the weight percent of
potassium carbonate and potassium bicarbonate in the mixture.

2.164 g of a solid mixture containing only potassium carbonate
(FW = 138.2058 g/mol) and potassium bicarbonate (FW = 100.1154
g/mol) is dissolved in distilled water. 32.22 mL of a 0.766 M HCl
standard solution is required to titrate the mixture to a
bromocresol green end point. Calculate the weight percent of
potassium carbonate and potassium bicarbonate in the mixture.

Three isotopes exist for potassium. Approximately 93 % of all
potassium atoms have a mass of 39 u. 7 % of potassium atoms have a
mass of 41 u. A very small proportion of potassium atoms have a
mass of 40 u. What is the atomic mass of potassium?
(a) 33.40 u (b) 39.14 u (c) 40.07 u (d) 40.86 u

A 2.1782.178 g sample of a solid mixture containing only
potassium carbonate (MM=138.2058 g/mol) and potassium bicarbonate
(MM=100.1154 g/mol) is dissolved in distilled water. A volume of
35.59 of a 0.763 M HCl standard solution is required to titrate the
mixture to a bromocresol green end point. Calculate the weight
percent of potassium carbonate and potassium bicarbonate in the
mixture.
K2CO3:________________________
KHCO3:__________________________

The freezing point of water is 0.00°C at 1 atmosphere. How many
grams of potassium carbonate (138.2 g/mol), must be dissolved in
228.0 grams of water to reduce the freezing point by 0.350°C ?
______g potassium
carbonate.

If the molarity of a solution of potassium carbonate is 0.567 m,
what is the weight percent?
A) 7.27%
B) 35.3%
C) 18.4%
D) 3.91%

2KHCO3(s) → K2CO3(s) +
CO2(g) + H2O(l)
How many moles of potassium carbonate will be produced if 487 g
of potassium hydrogen carbonate are heated?

determine the number of oxygen atoms in 8.18ng of Ba(NO3)2.

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