few q's. (1 Viewer)

[blackratpoo]

a) name the isotope that undergoes beta decay to form thorium - 227.

b) the molar heat of combustion of ethanol is 1367 kJ mol-1. what mass of ethanol is required to heat 1 mole of water by 10 degrees?

 

[locked.on]

Please find the solutions attached below.

Feel free to correct me if I am wrong. Please ask me to clarify anything that you still don't understand or that I may have not explained properly.

Hope it helps.

 

[blackratpoo]

wow. thanks heaps for these elaborate answers. b) is correct however the answer to a) is Actinium -227. do you think this is wrong?

 

[study-freak]

a) name the isotope that undergoes beta decay to form thorium - 227.

b) the molar heat of combustion of ethanol is 1367 kJ mol-1. what mass of ethanol is required to heat 1 mole of water by 10 degrees?

wow. thanks heaps for these elaborate answers. b) is correct however the answer to a) is Actinium -227. do you think this is wrong?

The answer is correct.
Beta decay is when a neutron decays into a proton (which stays in the nucleus) and an electron (which is emitted out as a beta particle). Hence atomic number increases by one while atomic mass stays the same.
Actinium-227 decays into a beta particle and Thorium-227.