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GarryVolchara [31]
2 years ago
6

Ldentify the atom whose nucleus is composed of 56 protons and 82 neutrons.

Chemistry
1 answer:
kenny6666 [7]2 years ago
4 0

Answer:

Barium-138

Explanation:

The mass number is the atomic number + the number of neutrons. ... Identify the atom whose nucleus is composed of 56 protons and 82 neutrons. Barium-138 (the number of protons identifies the atom) Gallium has two naturally occurring isotopes: Ga-69 with a mass of 68.9256 amu and a natural abundance of 60.11% and Ga-71.

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What is the difference between a nucleic acid and a nucleotide?.
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Nucleic Acid is a complex organic substance present in living cells, especially DNA or RNA whose molecules consist of many nucleotides linked in a long chain.

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What is the metal that is grouped with metalloids
vlabodo [156]

Answer:

The post-transition metals cluster to the lower left of this line. Metalloids: The metalloids are boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po). They form the staircase that represents the gradual transition from metals to nonmetals.

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3 years ago
8) 4.00 mol HI are placed in an evacuated 5.00 L flask and then heated to 800 K. The system is allowed to reach equilibrium. Det
SVEN [57.7K]

Answer: Concentration of H_2 at equilibrium = 0.08 M

Concentration of I_2 at equilibrium =0.08 M

Concentration of Hl = 0.64M

Explanation:

Moles of  HI = 4.00 mole

Volume of solution = 5.00 L

Initial concentration of HI =\frac{moles}{Volume}=\frac{4.00mol}{5.00L}=0.8M

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as K_c

For the given chemical reaction:

         2HI(g)\rightarrow H_2(g)+I_2(g)

Initial conc.      0.8 M           0 M    0 M

   At eqm. conc.  (0.8-2x) M   (x) M   (x) M    

The expression for K_c is written as:

K_c=\frac{[H_2]^1[I_2]^1}{[HI]^2}

0.016=\frac{(x)\times (x)}{(0.8-2x)}

x=0.08M

Concentration of H_2 at equilibrium = x M = 0.08 M

Concentration of I_2 at equilibrium = x M = 0.08 M

Concentration of Hl = (0.8-2x) = (0.8-2\times 0.08)M= 0.64M

3 0
3 years ago
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