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Question- a fictional element has two isotopes, each making up 50% of the population. Isotope 1 has a mass of 80.0 amu, isotope 2 has a mass of 85.0 amu. Calculate the atomic mass of the fictional element.
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Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)→ 2K2O(s) + 2N2(g) + 5O2(g)
calculate the energy of a photon of blue light that has a wavelength of 432 nm.a. 8.59 10-17 tb. 4.60 10-19 tc. 8.59
Bromine can form compounds or ions with any number of fluorine atoms from one to five. Write the formulas of all five of these species
How much heat is needed to warm 45.6 grams water from 23.0° C to 40.0 °C?
An experiment is performed on an unknown material and produces the following heat curve. The temperature of the material is shown as a function of heat added. If the sample of material has a mass of m = 9.80 g, calculate the specific heat when thi..
Elemental phosphorus reacts with chlorine gas according to the equation: P4 (s)+ 6Cl2 (g) --> 4PCl3 (l) A reaction mixture initially contains 45.11 g P4 and 132.0g Cl2. Once the reaction has occurred as completely as possible, what mass (in g) of ..
A 64 g piece of ice at 0 degrees celsius is added to a sample of water at 9 degrees celsius. all of the ice melts and the temperature of the water decreases to 0 degrees celsius. How many grams of water were in the sample?
Some liquid samples cannot be injected directly into an HPLC system because they could either damage the column or the HPLC system. For these samples, solid phase extraction (SPE) is used prior to analysis. Explain SPE
In the titration of 68.0 mL of 1.0 M methylamine, CH3NH2 (Kb = 4.4 10-4), with 0.49 M HCl, calculate the pH under the following conditions.
Nitrogen monofluoride, NF, can serve as a ligand in transition-metal complexes. a. Prepare a molecule orbital energy-level diagram of the NF molecule, showing clearly how the atomic orbitals interact.
Explain how many grams of NaCl in 400g of water to lower the ice bath temperature to -10 degrees C. 2) Explain what will be the boiling point elevation, Delta T, if we were to boil the solution described in the last problem
An acid would increase the concentration of H3O+ when it is dissolved in water c)A base must contain "OH" in its chemical formula d) A base is a hydroxide (OH-) donor e) An acid is a prton (H+) donor
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