# यसामन विऻानॊ सॊफॊधी प्रश्नों के सभाधान

A flask contains $$0.250$$ mol of liquid bromine, $$Br_2$$. Determine the number of bromine molecules present in the flask.
You may know that a million is $$10^6$$, a billion is $$10^9$$, and a trillion is $$10^{12}$$. A trillion trillion would be $$10^{24}$$ which is also known as a septillion.
The fuel used in many disposable lighters is liquid butane, $$C_4H_{10}$$. How many carbon atoms are in $$3.50$$ g 3.50 g of butane?