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gayaneshka [121]
3 years ago
6

How many atoms are in 7C2S2

Chemistry
1 answer:
Stolb23 [73]3 years ago
3 0

Answer:

4.2×10^24 atoms

Explanation:

number of atoms = Avogadro's number x number of moles

= 6.02 × 10^23 × 7

=4.2×10^24 atoms

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Which of the following provides an instantaneous measure of radioactivity:
Nikitich [7]

Answer:

Option 2 is correct.

Scintillation counters and Geiger Counters provide instantaneous measure of radioactivity.

Explanation:

Of the three means of measuring radioactivity presented. Only Film-badge dosimeter lacks a sensitive photo-detector piece that instantaneously converts the amount of radiation seen into electrical waves. It collects the radiation over time and the film is then developed after a particular point in time for the radioactivity collected to be measured.

Although used majorly for gamma rays and neutrons, the scintillation counters uses a scintillator to convert ionizing radiation (like the two mentioned at the start of this passage), into photons that the photo-detector (usually very sensitive) converts into electrical signals for immediate reading. It gives the energy and intensity of the radiation intended to.be measured.

The Geiger Muller counter, the most used measure of radioactivity across all fields, uses the tube (which contains inert gases) as the sensitive radiation detecting piece. High voltage maintained in the tube makes the gases conductive and it transmits the intemsity of radiation to the processing part of the counter which converts this reading to electrical signals, immediately for reading. Unlike the scintillation counters, it doesn't measure the energy of the radiation.

Hope this Helps!!!

5 0
4 years ago
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WORTH 99 POINTS PLEASE ANSWER!!! The table shows the solubility of two substances in water at 20 °C. Solubility of Substances Ma
Lunna [17]

Answer:

the difference between k and l is that (k) is more soluble than (L) because the mass of 200 has lower grams than 100.

3 0
4 years ago
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According to the lab guide, which changes below will you look for in order to test the hypothesis? check all that apply. changes
viktelen [127]

Answer:

All of them are.

Explanation:

8 0
4 years ago
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According to the following reaction, how many moles of calcium chloride will be formed upon the complete reaction of 27.9 grams
I am Lyosha [343]

Answer: 0.377 moles of calcium chloride will be formed.

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}    

\text{Moles of} Ca(OH)_2=\frac{27.9g}{74g/mol}=0.377moles

The balanced chemical reaction is:

Ca(OH)_2+2HCl\rightarrow CaCl_2+2H_2O  

According to stoichiometry :  

As 1 mole of Ca(OH)_2 give = 1 mole of CaCl_2

Thus 0.377 moles of Ca(OH)_2 give =\frac{1}{1}\times 0.377=0.377moles  of CaCl_2  

Thus 0.377 moles of calcium chloride will be formed upon the complete reaction of 27.9 grams of calcium hydroxide with excess hydrochloric acid

3 0
3 years ago
N2(g) + 3H2(g) → 2NH3(g) How many grams of N2 are required to produce 240.0g NH3?
just olya [345]

Answer:

\large \boxed{\text{197.4 g}}

Explanation:

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

Mᵣ:     28.01               17.03

            N₂ + 3H₂ ⟶ 2NH₃

m/g:                          240.0

(a) Moles of NH₃

\text{Moles of NH}_{3} = \text{240.0 g NH}_{3}\times \dfrac{\text{1 mol NH}_{3}}{\text{17.03 g NH}_{3}}= \text{14.09 mol NH}_{3}

(b) Moles of N₂

\text{Moles of N$_{2}$} = \text{14.09 mol NH}_{3} \times \dfrac{\text{1 mol N$_{2}$}}{\text{2 mol NH}_{3}} = \text{7.046 mol N$_{2}$}

(c) Mass of N₂

\text{Mass of N$_{2}$} =\text{7.046 mol N$_{2}$} \times \dfrac{\text{28.01 g N$_{2}$}}{\text{1 mol N$_{2}$}} = \textbf{197.4 g N$_{2}$}\\\\\text{The reaction requires $\large \boxed{\textbf{197.4 g}}$ of N$_{2}$}

7 0
3 years ago
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