A sample of gold-195 has an activity of 0.400 mCi. How many nanograms of Au-195 are present in the sample?
A sample of gold-195 has an activity of 0.400 mCi. How many nanograms of Au-195 are...
Calculate how many atoms of gold (Au) are present in 0.196 mol of Au ?
A freshly prepared sample of a radioactive isotope has an activity of 27.5 mCi. After 2.60 hours, the activity is 21.0 mCi. (a) Determine the half-life of the isotope. (h) (b) How many nuclei of the isotope were contained in the freshly prepared sample? (nuclei) (c) After how much time will the activity be 1.40 mCi? (h)
A freshly prepared sample of a certain radioactive isotope has an activity of 10.0 mCi. After 3.80 h, the activity is 8.30 mCi. (a) Find the decay constant and half-life of the isotope. (b) How many atoms of the isotope were contained in the freshly prepared sample? (c) What is the sample's activity 30 h after it is prepared?
Tia has a sample of pure gold (Au). She weighed the sample and the result was 52.9 grams. Tia wants to determine the number of atoms in the sample. Calculate the number of atoms in 52.9 g of pure gold. Au atoms
The density of gold (Au) is 19.32 g/mL. How many atoms are in a gold bar whose volume is 150 mL?
The activity of a sample of a radioisotope at some time is 10.9 mCi and 0.46 h later it is 7.30 mci. Determine the following. (a) Decay constant (in s-1) S-1 (b) Half-life (inh) (c) Nuclel in the sample when the activity was 10.9 mci nuclei (d) Activity (in mcl) of the sample 3.30 h after the time when it was 10.9 mci mci
A vial containing radioactive selenium-75 has an activity of 3.7 mCi/mL If 2.6 mCi are required for a leukemia test how many microliters must be administered Please show work.
Tia has a sample of pure gold (Au). She weighed the sample and the result was 61.1 grams. Tia wants to determine the number of atoms in the sample. Calculate the number of atoms in 61.1 g of pure gold.
Tia has a sample of pure gold (Au). She weighed the sample and the result was 73.9 grams. Tia wants to determine the number of atoms in the sample. Calculate the number of atoms in 73.9 g of pure gold.
The initial activity of a sample of the cesium isotope 137Cs is 120 mCi . When delivered to a hospital 13 hours later, its activity is 95 mCi. a.)What is the isotope's half life? th=___________ h b.)If the minimum usable activity is 10mCi, how long after delivery at the hospital is the sample usable? t=__________h