Calculate the mass percentage of aspirin (C9H804) in acetonitrile `(CH_3CN) when 6.5 g of `C_9H_8O_4` is dissolved in 450 g of `CH_3CN`.

Calculate the mass percentage of benzene (C_6H_6) and carbon tetrachloride (CCl_4) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride.

Calculated the mass percentage of benzene (C_6H_6) and carbon tetrachloride (C Cl_4) if 22 g of benzene is dissolved in 122g of carbon tetrachloride.

C-6 H_5 CH = CH-CHO is

Suggest the most important type of intermolecular attractive interaction in the following pairs: acetonitrile (CH_3CN) and acetone (C_3H_6O) .

The percentage by volume of C_(3)H_(8) in a gaseous mixture of C_(3)H_(8),CH_(4) and CO is 20. When 100mL of the mixture is burnt in excess of O_(2) the volume of CO_(2) produced is :

Calculate the enthaply change in the reaction, CH_(4)(g) + 2O_(2)(g) to CO_(2)(g) + 2H_(2)O (i)The enthalpy change of formation of CH_(4) (g), CO_(2)(g) and H_(2)O (i) are - 74.8 kj mol^(-1), -393.5 KJ mol^(-1) and - 286 KJ mol^(-1) respectively.

Calculate the standard enthaply of formation of CH_(3) OH(l) from the following data CH_(3) OH (l) + (3)/(2) O_(2) (g) to CO_(2) (g) + 2H_(2)O (l) , Delta_(r) H^(@) = - 726 kj/mol C(g) + O_(2) (g) to CO_(2) (g), Delta_(c) H^(@) = - 393 kj/mol H_(2)(g) + (1)/(2) O_(2) (g) to H_(2) O(l) : Delta_(f) H^(@) = - 286 kj /mol

Calculate the molecular masses of H_2,O_2,Cl_2, CO_2,CH_4,C_2H_4,NH_3,CH_3OH .