[DesertRose]

Hi, i am given a question that says;

Convert 0.35g BaOH to molecules. I am not really sure as to how to work it out. I did attempt it, converting it to moles and then molecules but i think i got the wrong answer. i got -9.222 * 10^25.

can anyone assist me by telling me the process to arrive at the correct answer??
and assistance would be greatly appreciated!!!
thank you!!!

[DemonicAcid]

Looks like you have approximately the right order of magnitude and your stated method is correct. Check your calculator. It helps to do everything individually to avoid order of operations errors.

[DesertRose]

Thank you! But by chance, is it possible to get molecules in a negative number (like the one i got?)
Again, thank you!

[DemonicAcid]

No, number of molecules must be positive.

[DesertRose]

Thank soo much for your assistance!!!!!!

[Borek]

Actually 10²⁵ looks like several orders of magnitude too much. With molar mass of barium hydroxide close to two hundred, given mass of substance must be in the 10^-2 moles range (if not less), that means 10²¹ molecules, not 10²⁵. And you don't need a calculator to see that.

[DemonicAcid]

I noticed that later on. Doing thermo caused me to mix up my physical constants.

[DesertRose]

Thank you!!
I used another method, and this answer looks more correct since you said that 10^21 should be the appproximate number. My answer is, 1.36 * 10^21.

Is that correct???

Any assistance would be kindly appreciated!!

[Borek]

My answer is, 1.36 * 10^21.

Is that correct???

No, as explained elsewhere.