General Chemistry Answers

2. One neutron and a new isotope, X, is formed when Bi-209 is bombarded with Ni-64. The isotope then goes through a series of alpha particle emission. Show your complete solution(4 points each)

a. Write the nuclear symbol for the isotope formed

b. Write the nuclear symbol for the isotope formed after the third alpha particle emission.

Write a balanced nuclear equation for the following: show your complete solution(3 points each)

a. K-capture of Ar-37

b. The loss of a beta particle by Pb-210

c. The fission of U-235 to give Ba-140, another nucleus, and an excess of two neutrons

d. The loss of an alpha particle by Th-230

An oxide of chromium is made up of 5.20 g chromium and 5.60 g oxygen. What is the empirical formula of the oxide? (Note: An oxide of nitrogen contains 63.1% oxygen and has a molar mass of 76.0 g/mol.)

Silicon dioxide solid plus aqueous hydrofluoric acid (HF) yield solid silicon tetrafluoride plus liquid water

A solution is made using 161.1 g of toluene (MM = 92.13 g/mol) and 80.0 g of benzene (MM = 78.11 g/mol). What is the molality of the toluene in the solution?

What is the boiling point of a solution composed of 15.0 g of urea, (NH2)2CO, in 0.500 kg

of water?

calculate the standard enthalpy of formation of CO2 from the following data:

1. C(s,graphite) + 1/2 O2(g) = CO(g) ∆H°25°c=-110.5 kJ
2. CO2(g)+C(s,graphite)= 2 CO(g) ∆H°25°c=172.5 kJ

Find the molarity of a solution prepared by dissolving 50gram of NaOH in 100ml of water

A galvanic cell consists of a chromium, Cr bar in a chromic sulfate solution, Cr2(SO4)3 containing 13 g and a silver, Ag bar in a silver sulfate solution (Ag2SO4 ) containing 37.8 g in a

3 L solution and a sodium sulfate solution use as a salt bridge solution. The silver electrode is positive relative to the chromium electrode. Write the cell half- reactions, overall reaction and cell notation.

how much of a 50.4mg sample pb-210 would remain after 89.2 years