Aquantity of 0.225 g of a metal m (molar mass = 27.0 g/mol) liberated 0.303 l of molecular hydrogen (measured at 17°c and 741 mmhg) from an excess of hydrochloric acid. deduce from these data the corresponding equation and write formulas for the oxide and sulfate of m.

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

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.

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?