What was the initial temperature in Celsius?

Sometimes in lab we collect the gas formed by a chemical reaction over water (see sketch at right). This makes it easy to isolate and measure the amount of gas produced. Suppose the O₂ gas evolved by a certain chemical reaction taking place at 30.0 °C is collected over water, using an apparatus something like that in the sketch, and the final volume of gas in the collection tube is measured to be 114. mL. g x10 X collected Ś gas Sketch of a gas-collection apparatus Calculate the mass of O₂ that is in the collection tube. Round your answer to 2 significant digits. You can make any normal and reasonable assumption about the 2 reaction conditions and the nature of the gases. water IS chemical reaction

A mixture of solid calcium oxide,  CaO,  and solid barium oxide,  BaO,  weighing  3.145 g  is added to a  2.00 L  flask containing carbon dioxide,  CO2,  at  30 ∘C.  The  CaO  and  BaO  react completely with the carbon dioxide gas to form solid  CaCO3  and  BaCO3,  respectively. Calculate the moles of  CO2  consumed by the reaction if the initial pressure of  CO2  gas was  0.796 atm  and the final pressure of  CO2  gas is  0.394 atm. moles of  CO2: molWhat is the mass percentage of  CaO  in the solid mixture? mass percent  CaO: % What is the mass percentage of  BaO  in the solid mixture?mass percent  BaO: %

Consider the following balanced reaction: 2 Z(g) + 4 A(g) → 3 Y(g) + 2 B(g) Occurs at STP   a. 4.65 mol of Gas Z reacts with excess Gas A, what volume Gas Y will be made in L?  b. If 5.76 mol of Gas Z reacts with 10.95 mol Gas A, identify the limiting reactant and calculate the volume of Gas B made in L.