$C_{m}=\frac{n}{V_{r}}\\\\
m=\frac{m}{M}\\\\
C_{m}=\frac{m}{MV_{r}} \ \ \ \ \Rightarrow \ \ \ \ m=C_{m}MV_{r}}\\\\
C_{m}=0.25\frac{mol}{L}\\
M_{CaBr_{2}}=200\frac{g}{mol}\\
V_{r}=50mL=0.05L\\\\
m=0.25\frac{mol}{L}*200\frac{g}{mol}*0.05L= \emph{\textbf{2.5g}}$

8 0

3 years ago

What is a common factor associated with most severe storms?

Volgvan

A common factor is low pressure system.

4 0

3 years ago

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In today’s experiment, some lab students let their chromatograms elute slightly longer than others. If one student’s solvent fro

larisa86 [58]

Answer:

They should obtain the same Rf for the same compounds.

Explanation:

The <em>Rf</em> is defined as A/B. Where A is the displacement of the substance of interest, and B is the solvent front.

By dividing the substance's displacement by B, we make it so that the Rf factor is equal for identical compounds in the same mobile phase, no matter what the solvent front is.

5 0

3 years ago

What do isotopes of an element contain?

My name is Ann [436]

Answer:

Explanation:

An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutron s, in addition to the number of proton s that uniquely defines the element. The nuclei of most atom s contain neutrons as well as protons

5 0

3 years ago