The mole fraction of glucose (C₆H₁₂O₆ ) in an aqueous binary solution is 0.1. The mass percentage of water in it, to the nearest integer, is _______.

The volume strength of 8.9 M H₂O₂ solution calculated at 273 K and 1 atm is ______. (R = 0.0821 L atm K^-1 mol^-1) (rounded off ot the nearest integer)

The total number of monohalogenated organic products in the following (including stereoisomers) reaction is ______.

An element with molar mass 2.7 $$ \times $$ 10^-2 kg mol^-1 forms a cubic unit cell with edge length 405 pm. If its density is 2.7 $$ \times $$ 10³ kg m^-3, the radius of the element is approximately ______ $$ \times $$ 10^-12 m (to the nearest integer).