1. How many moles are in 4.5 x 1022 atoms of Cu? 2. How many moles are in 8.5 x 1024 molecules of Nz?

3. How many molecules are in 0.025 moles of CH4?

4. How many atoms are contained in 1.26 moles of Pb?

5. How many molecules are in 0.56 moles of CO2?

What does the cell nucleus do or, how does it function?

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

What is the percentage of hydrogen in c2h4