Created by StemPy LabA metal M forms two oxides, P and Q. A student heats weighed samples of M in oxygen and finds the mass of oxygen that combines each time. The figure plots the mass of oxygen against the mass of M for both oxides. The atomic mass of M is and that of oxygen is . Which option gives the formulas of P and Q, and the ratio of the masses of oxygen that combine with a fixed mass of M in P and in Q?
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← A syringe holds 40.0 mL of a gaseous element X₂. A student pushes in a second gaseous element, Y₂, a little at a time. The two react completely to give one gaseous product, and she records the total volume of gas after each step. All volumes are at the same temperature and pressure. The figure shows her results. What is the formula of the product, and what volume of it is present after 60 mL of Y₂ has been added?A student writes the results of some calculations and roundings in her laboratory notebook. Each result should follow the NCERT rules for significant digits and for rounding off. (i) 2.5 × 1.25 is reported as 3.1. (ii) 4.52 m - 2.1 m is reported as 2.42 m. (iii) 2.865 rounded off to three significant digits is reported as 2.87. (iv) 0.04060 g is reported to have four significant digits. (v) A class register shows 40 students, and this number has an unlimited number of significant digits. How many of the statements above are correct? →
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