a solution was prepared by dissolving 177 mg of potassium sulfate (k2so4, mw = 174.24 g/mol) in 775 ml of water. calculate the following:
a) moles of k2so4
b)millimoles of k2so4
c)molarity of k2so4, k+, so4(2-)
d)ppm of k2so4
e)%(w/v) k2so4
f)pk+
g)pso4(2-)

Explanation:

a) Mass of potassium sulfate = 177 mg =0.177 g

1 g= 1000 mg

Molecular mass of potassium sulfate = 174.24 g/mol

Moles of potassium sulfate,n =

b) 1 mol = 1000 milli moles

0.001016  mol =0.001016 × 1000 milli moles = 1.016 milli moles

c)

n = moles of substance

V = Volume of the solution in L

Molarity of of potassium sulfate:

Volume of the solution = 775 mL = 0.775 L (Mass of solute is very less)

1 mol potassium sulfate gives 2 mol of potassium ions and 1 mole of sulfate ions.

Molarity of potassium ions:

Molarity of sulfate ions:

d)

Volume of solution = 0.775 L

Amount of potassium sulfate = 177 mg

e) Volume of the solution = 775 mL

Mass of potassium sulfate = 177 mg =0.177 g

f)

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them  

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8