Argon has three naturally occurring isotopes: argon-36, argon-38, and argon-40. Based on argon’s atomic weight on the periodic table, which isotope is the most abundant in nature? a) Ar-40 b) Ar-38 c) Ar-36 d) All isotopes are equally abundant in nature << I said this as my answer e) Not enough information is provided. How…
[ Chemistry ] Open Question : How much energy (in kilojoules) is released when 20.5 g of ethanol vapor at 97.5 ∘C is cooled to -17.0 ∘C?
Ethanol has mp = -114.5 ∘C, bp = 78.4 ∘C, ΔHvap = 38.56 kJ/mol and ΔHfusion = 4.60 kJ/mol. The molar heat capacity is 113 J/(K⋅mol) for the liquid and 65.7 J/(K⋅mol) for the vapor
Carbon monoxide (CO) is a poisonous gas because it binds very strongly to the oxygen carrier hemoglobin in blood. A concentration of 8.00 × 102 ppm by volume of carbon monoxide is considered lethal to humans. Calculate the volume in liters occupied by carbon monoxide in a room that measures 10.35 m long, 18.57 m…
Here s the question: What is the Molarity(M) of the 4ng/ml detection limit? Give your answer in nM. Anyone know how to do this?
C3H6 is re arranged to propylene At a certain temperature the following data were obtained relating concentration and rate Initial concentration of C3H6 ………..Rate of formation of propylene 0,050 M………………………………………..0,0000295 M/s 0,100 M………………………………………..0,000059 M/s 0,150 M………………………………………..0,0000885 M/s Question: What is the rate law for the reaction?
[ Chemistry ] Open Question : It is difficult to routinely lower the pressure in a vacuum chamber below 8.0×10−11 Torr.?
Calculate the molar density at this pressure at 303 K . Express the molar density in moles per liter to two significant figures. What fraction of the gas phase molecules initially present for 1.0 atm in the chamber are present at 1.0×10−10Torr? Express fraction to two significant figures.
My professor said that the valency value of carbon in methanol is -2. He used the equation: “Number of valence electrons – number of electrons owned” where the number of valence electrons was 4 and # of owned electrons is 6, hence -2. Carbon is thus oxidized, in his opinion. However, when I calculate using…
A 22.2 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 13.1 g. What was the mass of iron in the sample of ore?
[ Chemistry ] Open Question : The total pressure of a mixture of oxygen and hydrogen is 2.50 atm. The mixture is ignited, and the water is?
removed. The remaining gas is pure hydrogen and exerts a pressure of 0.439 atm when measured at the same values of T and V as the original mixture.
I want to make the word “science”. Sc is scandium, I is iodine, N is nitrogen and Ce is cerium. But I don t know what is e. It doesn t have to be in the periodic table. Thanks for reading if you know the answer please tell me 🙂