Question

1.) Provide the complete and net ionic equations for the following reaction: 2NaOH_(aq) + Pb(NO₃)_(aq) --> Pb(OH)_2(s) + 2NaNO_3(aq)

a.) Complete ionic equation:

b.) Net ionic equation:

2.) A single gulp of pure water has about 5.0 x 10²⁴ molecules of water in it. If water molecules could be counted individually at a rate of 1000 per second, how many years would it take to count all the water molecules in a single cup? A stellar life cycle is take to be 9.0 billion years, how many stellar life cycle would it take to count all the molecules in a single gulp of water? (a stellar life cycle is how long it takes for a star like ours to burn out)

3.) Balance the following reaction: (C₆H₇N₃O₁₁)_3(s) --> CO_(g) + CO_2(g) + H₂O_(l) + N_2(g)

Answer 1

1) INQ OH (c) + Pb(voz),(q) → Pb(H) (s) + 2NaNO, Caq) (a) complete ionic equation: 27 20a (aq) + 2014 (aq) + Pb (aq) + 2NO3(aq) Pb(OH) (s) + 2Natas) + 2ng (aq) ob Net ionic equation : 2 CH (99) + Pb "Can) 2+ Pb(OH) (5) 2) A single gelp of water has 5,0x 1024 molecules 1000 molecules can be counted in 1 sec. »5.0x1024 mlecules will be counted in 1-X SX1024 seconds 1000 We know, 21 seconds Go sec X . 5xlo 1 year = 365 days X 24hs, Gomin x day hir min 31536000 seconds sx 12's Seconds years 31536000 1.585 X 10" 1024 years so 1 XS X 1.27

9 billion = 1 stellar life yeare y 9 x 109 years 91 585X4014 years 1 steller life. IX 2880x1024 steller likes 98109 z 1.76 X 109 Stellar likes Ba (CH₂ N₃0,1); → Cot Coat H₂O + N₂ Balencing N, 2[CH, M3.01 cot Cot H₂ot 9N2 Balancing H, 2C6qHqN3 1 2 cot Cot 21 H₂O + 9 N For balancing c & o, let umoles co, y moles co be produced the balanced equation, Net moles of C in left met moles of c in night 36 = nty Also, net moles o inleft = net moles of o in night. 66 at zyt 21 3 45 = utay solving equation 0 and we y=9] & In=27 we get So balanced equation is 2 (C6 H₂N3 , = 2760+9 CO2 +21420 +9N,