Calculate the mass of 5.71 times 10^6 molecules of HCI A) 3.46 times 10^3 E B) 9

Question

Calculate the mass of 5.71 times 10^6 molecules of HCI A) 3.46 times 10^3 E B) 9.48 times 10^4 E C) 3.44 times 10^9 D) 2.60 times 10^4 E Convert 9.23 moles Cu[NO_3]_3 to grams of Cu[NO_3]_3 A) 20.3 E B) 4.92 times 10^2 E C) 1.58 times 10^3 E D) 1.73 times 10^3 E E) 9.23 times 10^2 E Which color of visible light has the most energy per photon? A) violet B) blue C) green D) yellow E) red The maximum number of electrons allowed in the "p" subshell is A) 2 B) 6 C) 10 D) 14 ES) none of these Which of the following has nonpolar covalent bonds? A) H_2O B) HCI C) Br_2 D) OF_2 e) all are nonpolar How many lone pairs of electrons, in total, are present in the Lewis structure of NI_3? A) 1 B) 4 C) 6 D) 7 E) 10 Which of the following has a triple bond? A) CH_4 B) CO C) SO_2 D) NO_3^- E) none of these

Explanation / Answer

1. 1 mole of HCl contains 6.023*1023 molecules. one moles of HCl correspond to 36.5 gm ( Molar mass = mass/moles, when moles =1, molar mass = mass= 36.5)

6.023*1023 molecules correspond to 36.5 gm

5.76*1013 molecules correspond to 36.5*5.76*1013/ 6.023*1023 gms =3.49*10-9 gm

2.mass of 9.23 moles of Cu(NO3)2= 9.23* molar mass of Cu(NO3)2= 9.23*188=1735.24 gm( C is corect)

3.

Since E= hC/wave length

higher wave length, lower energy and lower wave length, longer energy, Viloet light posses highest energy due to its short wave length.

4. Non polar molecule will have zero dipole moment. Hence Br2 is non polar,

5. P contains s2p4. Total number of electrons = 2+4=6

6.

Nitrogen triiodide lewis structure is shown. As shown, there is one lone pair of electrons and rest of the electrons are occupied by I ( A is correct).

7.

there is triple bond in CO as shown in Lewis structure.

In CH4, there are all single bonds, in

there are two double bonds in SO2.

there are no triple bonds in NO3-. So B is correct.

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