# Posts by Dermot

Total # Posts: 5

**Chemistry (mole question)**

Calculate the molar mass of potassium hydroxide (KOH). How many atoms would we find in a 100 mL solution of 1 µM KOH?

**Chemistry**

Hey i have an idea how to do this but am not sure could you please help and show work. 12 moles of a gas sample at an initial temperature of 12 degrees celcius at a pressure of 200 Pa is allowed to expand isothermally and reversibly against a pressure of 50 kPa. Calculate the ...

**Chemistry**

Calculate the amount of heat required to raise the temperature of 3 moles of oxygen gas from 298 to 400K. Given that C, of O2 is 29.36 Jmole-'K-'. Please show how to do it.

**Physics**

yes, sorry after 3 s, thanks.

**Physics**

A uniform solid sphere of mass 4kg and diameter 20cm initally at rest, begins to roll without slipping under the influece of gravity, down an incline that makes an angle of 15degrees to the horizontal 1 calculate the angular acceleration of the sphere 2 what is the total ...