A certain compound has a ratio of two atoms of element X for every one atom of element Y. Suppose a sample of element X and a sample of element Y react to form 1 kg of compound X2Y. After the reaction is complete, none of the reactants are left over. Which of the following could NOT be the masses of reactants X and Y

f

mExplanation:

f

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.