Verified Answer :

Use the formula 
first step: 
Use the formula 
molarity= mole/liter
change ml to l
plug in data
 to get .1=mole/.25 or .1M.25liter
which =.025 moles
then divide .025 moles by two because there are two OH in Sr(OH)2 
then multiply that by 265.76 (the molar mass of water) 
.0125265.76
which is 3.32grams this is your answer 




superman1987

The answer is = 3.322grams

The explanation:

1-First we need o get the no.of moles:

moles = molarity volume(L)

by substitution:

∴ moles = 0.1M 0.25 L

= 0.025 moles

but we have 2 OH in Sr(OH)2

so moles = 0.025 /2 = 0.0125 moles

2- then we need to get how many grams of it so, we are going to use this formula:

mass = moles molar mass

by substitution:

∴ mass = 0.0125 265.76

= 3.322 grams

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