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Greg
what is the value of the equilibrium constant for the reaction between I2(s) and Br-(aq) at 25C?
enter in scientific notation.
Please help, will offer ten pts
2 AnswersChemistry7 years agowhat are the charge and coordination number of the central transition metal ion(s) in each compound below?
K[Pt(NH3)Cl5]
[Pt(en)2Br2](ClO4)2
In [Cu(en)(NH3)2][Co(en)Cl4]:
[Cu(en)(NH3)2]X
X[Co(en)Cl4]
2 AnswersChemistry7 years agowrite the balanced nuclear equation for the formation of 241 95 Am through Beta- decay?
Please show the equation
1 AnswerChemistry7 years agothe half-life of radium-226 is 1.6x10^3 year. How many hours will it take for a 2.50-g sample to decay to the?
the half-life of radium-226 is 1.6x10^3 year. How many hours will it take for a 2.50-g sample to decay to the point where 0.185 g of the isotope remains?
1 AnswerChemistry7 years agowrite a balanced nuclear equation for the following reaction. Include both mass numbers and atomic numbers?
write a balanced nuclear equation for the following reaction. Include both mass numbers and atomic numbers with all atomic symbols. Alpha decay of 234 92 U
1 AnswerChemistry7 years agoArrange the following charge distributions in order of increasing charge density.?
1) 2-<+(3+<-
2) -<+<2-<3+
3) +<-<2-<3+
4) 3+<2-<-<+
5) 2-<3+<+<-
6) +<2-<-<3+
1 AnswerChemistry7 years agohow many moles of solute particles are present in 1 l (exact) of aqueous 4.20 M KBr?
10 points to answerer.
1 AnswerChemistry7 years agoWaste water from cement factory question.?
Wastewater from a cement factory contains 0.410 g Ca2+ ion and .0390 g Mg2+ ion per 100.0 L solution. The solution density is 1.001 g/mL. Calculate the Ca2+ and Mg2+ concentrations in ppm (by mass).
Ca2+
ppm?
Mg2+
ppm?
1 AnswerChemistry7 years agoA solution contains 0.270 mol of isopropanol (C3H7OH) dissolved in 3.940 mol of water.?
A) What is the mole fraction of isopropanol?
B) What is the mass percent of isopropanol?
C) What is the molality of isopropanol?
1 AnswerChemistry7 years agoThe repeat unit ina polystyere coffee cup has the formula C6H5CHCH2.?
If the molar mass of the polymer is 1.9x10^5 g/mol, what is the degree of polymerization?
I will give 10 points. Please answer.
1 AnswerChemistry7 years agoA 0.023 M solution of a weak acid (HA) has a pH of 4.18. What is the Ka of the acid?
Please help will give 10 points.
1 AnswerChemistry7 years agoDetermine Delta n(gas) for each of the following reactions:?
(a) MgCO3 (s) --> MgO (s) + CO2 (g)
(b) 2 H2 (g) + O2 (g) --> 2 H2O (l)
(c) HNO3 (l) + ClF (g) --> ClONO2 (g) + HF (g)
1 AnswerChemistry7 years agoThe rate constant of a reaction is 4.4*10^-3s^-1 at 25C, and the activation energy is 33.6 kJ/mol. What is k at 75C?
Enter in scientific notation.
1 AnswerChemistry7 years agoGive the oxidation state of sulfur in the following compounds. Do not include the "plus" sign if the oxidation state is positive.?
(a) S8
(b) SF4
(c) SF6
(d) H2S
(e) FeS2
(f) H2SO4
(g) Na2S2O3 * 5H2O
1 AnswerChemistry7 years agoWhich of the following pairs react to form ionic compounds?
(a) Cl and Br
(b) Na and Br
(c) P and Se
(d) H and Ba
1 AnswerChemistry7 years agoFor a function f(x, y), we are given f(100,200) = 45.1, fx(100,200) = 0.5 and fy(100,200) = − 0.35.?
Estimate f(100, 198)
1 AnswerMathematics7 years agoFor the function f(x, y) = − x2 + xy + y2 + At, what value of A gives a local maximum at (-2,-4)?
- 5
- 10
- -10
- not a possible value of A
1 AnswerMathematics7 years agoCalculate the molarity of 47.1 g of table sugar (C12H22O11) in 100. mL of solution.?
First to answer correctly gets 10 points!
3 AnswersChemistry7 years agoThe Henry's law constant (kH) for O2 in water at 20 C is 1.28x10^-3 mol/(L*atm).?
(a) How many grams of O2 will dissolve in 1.75 L of H2O that is in contact with pure O2 at 1 atm?
(B) How many grams of O2 will dissolve in 1.75 L of H2O that is in contact with air where the partial pressure of O2 is 0.209 atm?
1 AnswerChemistry7 years ago