Explanation:
Relation between molarity and molar mass is as follows.
Molarity = 
It is given that mass is 1 mg/ml which is also equal to 
g.
Molecular mass = 58 Da = 58 g/mol
Volume = 1 ml
Therefore, calculate molarity as follows.
Molarity =
= 
= 0.0172 molar
It is known that 1 molar equals 1000 millimolar.
So, 0.0172 molar = 
= 17.2 millimolar
Thus, we can conclude that the concentration of given solution is 17.2 millimolar.
Answer:
-40.0 °C
Explanation:
Change in temperature can be written as 
. The variables are defined below here:
means change in temperature.
means the final temperature value.
means the initial temperature value.
From the question, we know the temperature changes <em>from</em> 65.0 °C <em>to </em>25.0 °C. Therefore, our initial temperature is 65.0 °C and final temperature is 25.0 °C.
Hence:
Therefore, the change in temperature is -40.0 °C.
Whether it floats or sinks depends on how much the charcoal weighs and how much water is used in the experiment. If the object is heavier than the water, it will sink. If it is lighter, it will float.
Answer is: D) Be, Mg, Sr.
Beryllium, magnesium and strontium are alkaline earth metals (group 2 of Periodic table of elements).
The elements have very similar properties.
Alkaline earth metals have in common an outer s- electron shell (two electrons). For example, magnesium atom.
Atomic number of magnesium (Mg) is 12, it means that it has 12 protons and 12 electrons.
Electron configuration of magnesium atom: ₁₂Mg 1s² 2s² 2p⁶ 3s².
