A 1.00 g sample of gas occupies 250 ml at 273 k and 1.00 atm. calculate the molar mass of the gas.

Reaction involved in present system is :   c12h22o11 + h2o → 2 c6h12o6the reaction system is obeying following rate law:   rate = k[c12h22o11]thus, it is a first order reaction.now, for 1st order reactionrate constant (k) =  given: initial conc. = 3.0 g, final conc. = 2.7 g, t = 2.5 h∴rate constant (k) =  ∴ k = 0.04215 h-1now, for 1st order reaction, half life = 0.693/k = 0.693/0.04215 = 16.4 hthus correct answer is option b

What is your question i dont understand well sorry 

Answerbasaltic magma allows dissolved gases to bubble upward and escape

Eka-boron (scandium)eka-aluminium (gallium)eka-manganese (technetium)eka-silicon (germanium) btw mendeleev was the scientist