C) Ammonia is added to copper sulphate solution till excess?

Balance the following reaction. as2s3 + 9o2 → 2as2o3 + so2

How many moles are in 1.26*10^24 particles in significant figures

Imagine you are a business executive who wants to pursue an environment policy for your company that limits pollution and uses fewer raw materials but would cost more what might be the discussion to your next broad meeting how would you make your case to your shareholders