Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide according to the following equation: 2NH3(g) + CO2(g) → (NH2)2CO(aq) + H2O(l). In one experiment, 637.2 g of NH3 is allowed to react with 1142 g of CO2. Which of the two reactants is the limiting reagent?
Calculate the massof (NH2)2CO that could theoretically be formed by this reaction.​

Different isotopes indicate that an element will have different numbers of

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.

How does concentration affect reaction rate