Lehman Collegs of the Cy Uraversay Department of Chemietry 1) When Mo0s and Zn a

Question

Lehman Collegs of the Cy Uraversay Department of Chemietry 1) When Mo0s and Zn are heated together they react according to the equatio the maximum number of moles of Zn0 formed when 20.0 moles of Moos is moles of Zn? 3Zn(s) 2 Moos(s) >Moz0(s) 3Zno(s) 10 moles nt mo_ b 20 moles c. 30 moles d. 40 moles e. 50 moles 2) What is the formal charge on the terminal nitrogen atom (the one at the end) in N20 according to the Lewis structure provided? c. 0 d. +1 e) +2 3) How many atoms of F are in 3.97 x 102 molecules of stannous fluoride SnF a. 3.97 x 102 atoms b. 6.58 x 10-2 atoms c. 1.19 x 103 atoms d. 7.94 x 102 atoms e. 2.38 x 102 atoms 4) Gas pressure is a result of which of the following a. collisions of gas particles with each other b. expansion of gas particles in an open container G the resistance of gas particles to flow collisions of gas particles with the walls of the container compressibility of gas particles e. Phese 100 A sample of an unknown compound X is stored at a pressure of 70 atm and a temperature of 0°C. According to the phase diagram shown to the right, which change of state does the sample undergo if it is heated to 500°C without changing the70 pressure? a.) Melting 5) 60

Explanation / Answer

Ans 1 : c) 30 moles

When two moles of MoO3 react 3 moles of ZnO are formed

So when 20.0 moles of MoO3 react ( 20.0 x 3) /2

= 30.0 moles of ZnO will be formed

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