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Questions in chemistry

[Sagot para sa’yo] a sample of dinitrogen tetroxide (N2O4) gas occupies 144 L at STP. how many moles of nitrogen atoms are present in this sample? __ moles

[Sagot para sa’yo] The 2022 Nobel Prize in Chemistry was awarded to three pioneers in the field of click chemistry: two- time Nobel Laureate Barry Sharpless, who coined the term "click chemistry" in 1998; Carolyn Bertozzi, founder of The Bertozzi Group at ______ and Morten Meldal, a professor at the University of Copenhagen in Denmark. Which choice completes the text so that it conforms to the conventions of Standard English? Choose 1 answer: Choose 1 answer: (Choice A) Stanford; A Stanford; (Choice B) Stanford, B Stanford, (Choice C) Stanford C Stanford (Choice D) Stanford: D Stanford:

[Sagot para sa’yo] A solution of calcium nitrate is made by dissolving 16.4g in 2 litres of solution. Calculate the concentration of nitrate ions in per liter. (Ca=40,N=14,O=16)

[Sagot para sa’yo] when do we use the periodic table

[Sagot para sa’yo] A sample of gas is held in a 675-mL container at a pressure of 1.60 atm . The sample is stored indoors at 25°C before being transferred to a new container and shipped to an outdoor facility with a temperature of 15°C . The pressure in the new container is measured to be 2.30 atm. What is the volume of the gas in the new container?

[Sagot para sa’yo] what would be the temperature of a 24.2g sample of carbon if 575.6J of heat energy was applied

[Sagot para sa’yo] How much time is required for a 6.30 mg sample of 51Cr to decay to 0.700 mg if it has a half-life of 27.8 days? Express the time in days to one decimal place.

[Sagot para sa’yo] What is the major organic product of the given reaction: Reactant 2-chloro-3-methylbutane, Reagents: H2O and isopropyl alcohol

[Sagot para sa’yo] solve the questions and the reasons why

[Sagot para sa’yo] 2Al2O3 --> 4Al + 3O2 The experiment was performed and 12.5g of oxygen was actually obtained. What is the percent yield for the reaction?