5.17 tg is how many ng

5.17×10^21 ng

Explanation:

I assume you meant Tg if yes, the answer is this:

T is 10^12

5.17 Tg is 5.17×10^12 g

and n is 10^-9. but as we're converting g to ng, we don't include the - .

so now all we have to do is to put them all together!

5.17×10^12×10^9= 5.17×10^21 ng

if anything is unclear, ask me.