Standards of weights and measures.
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100 atoms is the same as how many moles?
nº atoms /avogadre number= nº of moles
100/6,022x10^23= 1,66x10^-22 moles
the molar mass is: mass/moles
we know that the molar mass of carbon 12 it's the same as his atomic number, which is 12.
So, using the previous formula:
12= mass/ 1,66x10^-22
mass= 1,992x10-21 grams of carbon 12
The famous Great Wall of China is considered to be the first line of defense and warning and was not even seen as an impenetrable barrier to those nomadic invaders and tribes. The view of the Great Wall was a vast plain of northern China that extends more than 300,000 sq. kilometers to the south.
Moreover, the region was comprised of coastal lowlands, Piedmont tablelands, highlands prairies and enormous mountains extending approximately 3170 miles from east to west. With this massive land mass and wide variations in climate and environmental factors such as unpredictable water currents in rivers, steppes, desert lands and impenetrable ridges, it was truly a first line of defense of China.
Answer:
d. Launch of soviet satellite sputnik
Explanation:
