If 10.7 grams of nh4cl is dissolved in enough water to make 800 ml of solution, what will be it's molarity

Molarity = 0.25 M

Molarity is given by moles/Liter.

First we find moles:

Number of moles = Mass /molar mass

= (10.7g NH4Cl)/(53.5g/mol NH4Cl)

= 0.200 moles NH4Cl  

Then  we convert to liters:

= (800mL)*(1L/1000mL) = 0.800L  

Therefore; molarity = 0.2moles/0.8L

                                = 0.25M

- decrease the number of plants and animals living in the water.