6 moles of potassium permanganate (KMnO4) are dissolved in enough water to make a 3M solution. What is the volume of the solution expressed in mL.

2000 mL

Explanation:

Given data:

Number of moles KMnO₄ = 6 mol

Molarity of solution = 3M

Volume of solution in mL = ?

Solution:

Formula:

Molarity  = number of moles of solute / volume of solution in L

3 M = 6 mol / volume of solution in L

volume of solution in L = 6 mol/ 3 M

volume of solution in L = 2 L

Now we convert the L into mL:

1 L = 1000 mL

2 L × 1000 mL / 1 L

2000 mL

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"