Define the activity in becquerels and curies

Assignment Help Chemistry

Reference no: EM13488574

A sample of material contains contains 20 mg of I ^131. Calculate: A) The number of I ^131 atoms initially present. B) The activity in becquerels and curies. C) The number of atoms that will remain in 40 days. D) The number of atoms that will remain in 80.207 days. E) The time it will take for the activity to reach 0.001 curies.

Reference no: EM13488574

Questions Cloud

Explain what is the percent of iron in the ore : A 1.45 g sample of an iron ore is dissolved in an acid and the iron is obtained as Fe+2 (ag). To titrate the solution, 21.6 mL of 0.102 M KMnO4 (aq) is required. The Fe+2 solution reacts with MnO4- as follows: 5Fe+2 (aq) + MnO-4 (aq) + 8H+ (aq) --..

What was m&ss pension expense for 2009 and 2010 : What information does M&S provide on the target allocation of its pension assets? How do the allocations relate to the expected returns on these assets?

Analysing coca cola external business environment : Read the Coca Cola Amitil Annual reports 2004, 2008 and 2012 - Conducted any additional research that you believe would enhance a presentation on analysing your Coca Cola external business environment.

What is the mass of the asteroid : A spherical asteroid has a radius of 545 km and a surface g of 3.0 m/s2. What is the mass of the asteroid, What is the potential energy of a 1 kg object on the surface

Define the activity in becquerels and curies : A sample of material contains contains 20 mg of I ^131. Calculate: A) The number of I ^131 atoms initially present. B) The activity in becquerels and curies.

What amounts relative to income taxes does m&s report : How much of M&S's 2010 total provision for income taxes was current tax expense, and how much was deferred tax expense?

Define the majority of industrial method for the preparation : The majority of industrial method for the preparation of elemental phosphorus is heating a mixture of phosphate rock, carbon, and sand in electric furnace. The chemical reactions can be represented by 2Ca3(PO4)2 + 6SiO2 ? 6CaSiO3 + P4O10 and P4O10..

What number of diluted weighted-average shares outstanding : How many options were exercisable on March 29, 2010? 3) What number of diluted weighted-average shares outstanding was used by M&S in computing earnings per share for 2009 and 2010? What were M&S's diluted earnings per share in 2009 and 2010?

Explain reaction spontaneous or unspontaneous : For a particular reaction, ?H = 139.99 kJ and ?S = 298.7 J/K. Calculate ?G for this reaction at 298 K. Is this reaction spontaneous or unspontaneous?

User Account

All Pages