The half-life of 199Tc, a ߯ emitter, is 15.8 s. (a) How many atoms of 199Tc are present in a sample with an activity of 0.200 µCi. (b) What is the mass of the sample? 43

Q: Sterling silver contains 93.5% silver, if a necklace made of sterling weighs 15g. What is the mass o...

A:

Q: Calculate the molar solubility of aluminum hydroxide in a solution buffered at pH = 4.50. Al(OH)3 (...

A: Consider the given information is as follows; pH = 4.50Ksp = 1.3×10-33       

Q: 1. Why must the esterification mixture not boil? 2. Why does the smell of the product become more pr...

A:

Q: What are the major products from the reaction of methyl butanoate with diisobutylaluminum hydride at...

A: Solution is given below with mechanism In next step   

Q: 1. Determine the number of chiral centers in each molecule below. Label each with an asterisk. HO b....

A: Since you have posted two different questions as per guidelines we can answer only one per session ....

Q: What equilibrium arrow best fits the reaction

A: The answer is as follows:  

Q: rate

A:

Q: the 4 Hume-Rothery rules

A: We have to tell in this question that the 4 Hume- Rothery rules that gives guidelines on the likelih...

Q: What volume of nitrogen monoxide is required to react with 141 liters of hydrogen gas according to t...

A: Given Reaction:-  NO(g) + H2(g) ----> N2(g) + H2O(l) 

Q: Instructions: Provide the correct IUPAC name for the following organic compounds. If geometric isome...

A:

Q: half-reactions

A:

Q: What is the molarity of ions in a 0.838 M solution of Ca(OH)₂ assuming the compound dissociates comp...

A:

Q: Which never changes the position of a system at equilibrium? O Changing the concentration of one com...

A:

Q: how you would prepare each of the following solutions

A: Initial concentration of stock solution = M1  Volume of stock solution to be used = V1 Concentration...

Q: 4.40 Draw the structure of a hydrocarbon that reacts with only 1 equiva- lent of H2 on catalytic hyd...

A:

Q: what is the change in the enthalpy in kj/kg for the complete combustion of 39.0 g of fructose, rough...

A:

Q: What is the relationship between vapor pressure at a temperature and its melting point so that subli...

A: When a solid heated to give gas directly without leaving any residue is called sublimation this meth...

Q: 2. Model C2H6, C2H4, and C2H2. Visualize/sketch molecular orbital(s) and identify if it is o- or t- ...

A:

Q: ih vghene In icho (OM bela bru Ol b) Using the axes below, draw a complete reaction coordinate diagr...

A: Reaction coordinate diagram is the plot made by plotting energy of species Vs progress of reaction.

Q: Percent Yield and Variations of Stoichiometry Show ALL work for the following calculations: 1. 168 g...

A:

Q: One of relatively few reactions that takes place directly between two solids at room temperature is ...

A: Balanced chemical equation is one in which the number of atoms of each kind is equal on both sides o...

Q: Predict the products of the following reaction. If no reaction will occur, use the NO REACTION butto...

A:

Q: What is the pH of a solution which is 0.021 M in weak base and 0.039 M in the conjugate weak acid (K...

A:

Q: 21. Which pai r will likely not show fac/mer isomerism? 1. Potassium trichlorotrifluoroplatinate(IV)...

A:

Q: Consider the structures of greenhouse gases, CO2 and CH4. Carbon dioxide has a very long lifetime in...

A:

Q: A 25.0 mL solution of HCl is neutralized with 22.9 mL of 0.240 M Ba(OH)₂. What is the concentration ...

A:

Q: Based solely on the amount of available carbon, how many grams of sodium oxalate, Na2C204, could be ...

A:

Q: Some chemicals, like hydrogen peroxide, can you prevent photocatalysis? 1. are prone to decompositio...

A: We are authorised to solve only one question at a time. Please post rest of the questions separately...

Q: d) Assume all of the Ca2* in the water comes from CaCO3. How many moles of CaCO, are in 1 L of water...

A: Answer

Q: unknown base with hydrochloric A mixture of an acid concentration was 0.01 normal, and the volume of...

A:

Q: You are given a 125 mL aqueous solution containing an unknown amount of NH4Cl salt. The solution has...

A: Given that, pH of solution =4.82  volume =125 ml =0.125 L  mass of NH4Cl =?   

Q: НОАС propanol (excess)

A: This reaction  is protection  of carbonyl  group  of ketone functional group.  The final product  is...

Q: . 2-pentanol 15. Ethanoic acid (vinegar) when diluted to low concentrations by water can be prepared...

A:

Q: 2. Acetylene (C:H:) is used in welding in areas hard to reach with electricity. It burns with oxygen...

A: The solution is as follows:  

Q: How many grams of Ag2CO3 will precipitate when excess Na2CO3 solution is added to 41.0 mL of 0.744 M...

A:

Q: Vàitine C نعفاكملA 18.95589 وكاءعل 17.64589 ۹۹494هل علسطلمعسد

A: Answer:

Q: How many grams of 10 % aqueous solution of HCL is needed to prepare 500 mL of the solution?

A:

Q: 4. Determine the oxidation state for all atoms in each of the following compounds a. KMNO4 b. NiO2 c...

A: Oxidation state is the hypothetical charge an atom would have if all bonds to atoms of different ele...

Q: Create a scenario would show the smallest deviation from an ideal gas (i.e., would show the most ide...

A:

Q: 11.4. a) Which layer contains the most ozone? b) How thick is the troposphere? c) What type of gas i...

A: Given problem is based on earth atmosphere and how this atmosphere affects the climate of the earth.

Q: Salicylic acid reacts with acetic anhydride to form aspirin, acetylsalicylic acid. If the percent yi...

A:

Q: You add hydrochloric acid slowly to the water and notices that the flask feels hot. What is the syst...

A: A question based on chemical thermodynamics that is to be accomplished.

Q: A mixture of unknown base and hydrochloric acid was removed with a concentration of 0.01 normal, and...

A: A titration is the process of determining the quantity of a substance A by adding measured increment...

Q: A student conducted an experiment where water was pipetted into a graduated cylinder and then weighe...

A:

Q: The 1H-NMR spectrum of lycopene is provided below. Comment on the general features of the NMR spectr...

A: The 1H - NMR spectrum is analyzed. :

Q: O CHEMICAL REACTIONS 3/5 Predicting precipitation Complete the table below by deciding whether a pre...

A:

Q: Consider the galvanic cell based on the following half-reactions: Mn2+ + 2e + Mn e° = -1.18 V Cd2+ +...

A:

Q: which atom has the most neutrons Choice A: neon-20 Choice B: Phosphorous-32 Choice C: Chlorine-35...

A:

Q: (e) Platinum has an FCC crystal structure. The atomic radius of platinum is 0.1387 nm. An X-ray diff...

A: The diffraction of X-rays from crystal surface follow Bragg's equation, nλ=2dsinθn=order of reflecti...

Q: 1 CaCO3(s) + 2 HCl(aq) → 1 H2O(l) + 1 CO2(g) + 1 CaCl2(aq) (Use balanced equation above to calculat...

A: Given :-  1 CaCO3(s) + 2 HCl(aq) → 1 H2O(l) + 1 CO2(g) + 1 CaCl2(aq)  molarity of HCl = 0.100 M  vol...

Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.