Select the correct answer. Given: SnO2 2H2 → Sn 2H2O Tin oxide reacts with hydrogen to produce tin and water. How many moles of SnO2 are needed to produce 500. 0 grams of Sn? A. 1. 57 B. 4. 21 C. 634. 8 D. 59,350.

c. 75.7

i think that is the right

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.