Answer:
The answer to your question is 3.75 mg
Explanation:
Data
Radium-223
half-life = 11 days
mass = 60 mg
total time = 44 days
Process
1.- Draw a chart to start the calculation
Mass Number of days Half-lives
60 mg 0 0
30 mg 11 1
15 mg 11 2
7.5 mg 11 3
3.75 mg 11 4
Total number of days 44
Mass active after 44 days = 3.75 mg
A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Answer:
His measurements will be more precise if he uses a graduated cylinder that measures to the nearest tenth of a mL.
Explanation:
Answer:
0.00369 moles of HCl react with carbonate.
Explanation:
Number of moles of HCl present initially =
moles = 0.00600 moles
Neutralization reaction (back titration): 
According to above equation, 1 mol of NaOH reacts with 1 mol of 1 mol of HCl.
So, excess number of moles of HCl present = number of NaOH added for back titration =
moles = 0.00231 moles
So, mole of HCl reacts with carbonate = (Number of moles of HCl present initially) - (excess number of moles of HCl present) = (0.00600 - 0.00231) moles = 0.00369 moles
Hence, 0.00369 moles of HCl react with carbonate.