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what is the difference between a certain number and an uncertain number in a measurement? which certain and uncertain numbers count as the significant figures of a measurement?
the naturally occurring compound urea conh22 was first synthesized by friedrich wohler in germany in 1828 by heating
Does the iron in the Fe(NH4)2SO4 solutions function as an oxidizing agent or a reducing agent. Please explain
If 42.3 L of PH3 forms when 85.1L of H2 (g) reacts with 167.6 (g) of P4 at STP. What is the percent yield.
A 1.525 g sample of a compound between sulfur and oxygen was prepared by burning 0.7625 g of sulfur in air and collecting the product. What is the empirical formula for the compound formed
An element X forms the oxalate complex X2C2O4 which is 7.91% C and 21.07 % O by mass. What is the identity of the Element X
what is the least amount of energy that can be emitted by an excited electron in a hydrogen atom falling from an excited state directly to the n=3 state? what is the quantum number n for the excited state
100.0 g of nickel at 150 °C was placed in 1.00 L of water at 25.0 °C. The final temperature of the nickel-water mixture was 26.3 °C.
Looking at the table of first ionization energy, if the n=1 shell held 3 electrons max instead of 2, then the first ionization energy for Li(g) would be around _____ MJ/mol.
When a chiral carbon contains a hydrogen, you should not show the hydrogen, but you must use either a wedge or dashed bond and 2 sticks to establish stereochemistry.
The surface area of 100 g of glucose > than that of 1 g. give explanation why the solubility does not increase with the amount of solid deposited at the bottom of the flask?
Use the rydberg equation to calculate the wavelength (in nm) of the photon emitted when an electron in a hydrogen atom undergoes a transition from n=4 to n=2.
Hydrogen (H2(g)), 100.L at 380.mm Hg reacts at 150°C in a 110.L container with oxygen O2(g) (10.0L at 3.00 atm) to give water (H2O(g)). (a) How many moles of H2O(g) much water is formed? and (b) What are the total pressure and the partial pressure..
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