Magnesium bromide is prepared in a laboratory using the reaction below. Typically, the magnesium bromide is recovered as a solid by heating away the remaining water, MgO(s) + 2 HBr(aq) - MgBr2(aq) + H2000
10 940 mole of HBr in solution is added to 16.5 grams of Mgo in a beaker and then is heated until dry, what are the expected contents of the beaker?
0 880 mole of MgBr2(8) and 0.060 mole of Mgo(s)
А
B
0.410 mole of MgBr2(s) and 0.060 mole of MgO(s)
0409 mole of MgBrz(s) and 0.531 mole of HBr(s)
D
0.409 mole of MgBrz(s) and 0.121 mole of HBr(s)

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.