Chemistry, 19.11.2019 05:31 rakanmadi87
Adisposable tank of helium can be purchased to fill up balloons. such tanks hold about 422 liters of helium compressed to 17.7 atm at room temperature (or 393k), and cost about $50. use the ideal gas law (pv = nrt) to calculate the number of moles of helium gas in the tank. for these units of pressure and volume, r = 0.0821 atm l/mol k.
Answers: 2
Chemistry, 22.06.2019 17:00
Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness
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Chemistry, 22.06.2019 18:10
Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)
Answers: 1
Chemistry, 22.06.2019 21:00
How many neutrons does an element have if its atomic number is 50 and its mass number is 166
Answers: 1
Chemistry, 22.06.2019 22:30
3.09 lab: reaction of metals 1 which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.
Answers: 1
Adisposable tank of helium can be purchased to fill up balloons. such tanks hold about 422 liters of...
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