A chemist repairs a solution of nickel chloride by measuring out 181. umol of nickel chloride

4.02x10^–4 mol/L

Explanation:

Data obtained from the question. This includes:

Mole of NiCl2 = 181 μmol = 18x10^–6 mole

Volume = 450 mL = 450/1000 = 0.45L

Molarity =?

Molarity is defined as mole of solute per unit litre of the solution. Mathematically, it is a represented by:

Molarity = mole /Volume

With the above formula, we can easily find the molarity of NiCl2 as follow:

Molarity = 181x10^–6 /0.45

Molarity of NiCl2 = 4.02x10^–4 mol/L

Therefore, the concentration of NiCl2 is 4.02x10^–4 mol/L

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

passing a magnet thought the

mixture , because iron gets attracted to magnet .