Answer:
Explanation:
The balanced chemical reaction to obtain water from SnO₂ is:
The mole ratio is:
[tex]\dfrac{1molSnO_2}{2molH_2O}[/tex]
Find the number of moles equivalent to 1.20× 10²¹ molecules of water, using Avogadro's number:
[tex]1.20\times 10^{21}molecules\times \dfrac{1mol}{6.022\times 10^{23}molecules}=1.9927\times 10^{-3}moles[/tex]
From the mole ratio, the number of moles of SnO₂ are half the number of moles of water. That is:
Use the molar mass of SnO₂ to convert the number of moles to grams:
The answer must be reported with 3 significant figures.
