Question

36 What is the percent by volume (% v/v) of ethanol in a solution prepared by adding enough water to 65.0 mL of ethanol to make 227 mL of ethanol solution? a) 6.50% b) 2.27% C c) 3.49% d) 40.1 % e) 28.6% O f)32.4% Which of the following can react with 1 sulfur atom to form a covalent compound? 37 a) 1 chlorine atom b) 2 hydrogen atoms c) 2 sodium atoms d) 1 hydrogen atom e) 1 calcium atom f) 1 nitrogen atom 38 What is the predicted shape of a molecule with the general formula AX E2-two unshared pairs of electrons? a) angular b) linear c) triangular d) trigonol pyramidal e) tetrahedral What is the coefficient value of H2O when the following equation is completely balanced? C3H6O+02- CO2 + 39 H2O a) 1 b) 2 c) 3 d) 6 e) 9 f) 12 OOOO0O OOOOO O000O O

Answer 1

Q(37)

Volume percent of ethanol = (volume of ethanol)/(total volume)

Volume percent of ethanol = 65.0ml/227ml

Volume percent of ethanol = 28.634%

Answer = e = 28.6%

Q(37)

We know that H_{​​​​​​2}​​​​​S is a covalent compound of sulphur. ( Compounds of non metal non metal atoms)

Answer = b = 2 hydrogen atoms

Q(38)

Here, there is two bond pairs and two unshared pairs (lone pair)

AX2E2 x bond paiot E = lone paiat CUnshared paiss) Total pais 2+2= 4 Hybaidisation in AxE,8p3 C18 and 3P 4 oobital) Accoding to hybidisation geometou of AX,E, e tetoahedsa But electoton paist does nat doom bond. Now Answe Co2t H20 Cs,0+O2 balanced cheminal onction is -39 3c02 3H20 t C3O 302 + Coedicient valus o H20 =3 Answen C)3