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lukranit [14]
4 years ago
15

Balance these 2 equations AND identify the products and the reactants:

Chemistry
1 answer:
iogann1982 [59]4 years ago
6 0

Answer:

Explanation:

1) NaCl → Na + Cl₂

2) Na + HCl  → NaCl + H₂

Chemical equation:

NaCl → Na + Cl₂

Balanced chemical equation:

2NaCl → 2Na + Cl₂

There are two moles of sodium and two mole of chlorine on both side of equation so given chemical equation is correctly balanced and follow the law of conservation of mass.

2)

Chemical equation:

Na + HCl  → NaCl + H₂

Balanced chemical equation:

2Na + 2HCl  → 2NaCl + H₂

There are two moles of sodium and two mole of chlorine and hydrogen on both side of equation so given chemical equation is correctly balanced and follow the law of conservation of mass.

Law of conservation mass

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

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Water’s density is 1 g/cm3 and AL is 2700kg/m3
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I’m not sure how to do this, please help. It’s a mole to mole stoich worksheet.
wlad13 [49]

Answer: 4.05 mol O2, 15.36 mol H2O

Explanation:

I can answer each question individually if you post them individually.

2a. 3.24 mol NH3 * (5 mol O2 / 4 mol NH3) = 4.05 mol O2

2b. 12.8 mol O2 ( 6mol H2O/ 5 mol O2) = 15.36 mol H2O

Essentially what I did was dimensional analysis. Multiplying in a way that the units cancel out so the only thing remains is what each question asks for.

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Which particle is represented by the atomic model?
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A creative super(hero/villian) using the element Zinc in the name
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3 years ago
For most solids at room temperature, the specific heat is determined by oscillations of the atom cores in the lattice (each osci
Cloud [144]

Answer:

The specific heat of copper is  C= 392 J/kg\cdot ^o K

Explanation:

From the question we are told that

The amount of energy contributed by each oscillating lattice site  is  E =3 kT

       The atomic mass of copper  is  M =  63.6 g/mol

        The atomic mass of aluminum is  m_a = 27.0g/mol

        The specific heat of aluminum is  c_a = 900 J/kg-K

 The objective of this solution is to obtain the specific heat of copper

       Now specific heat can be  defined as the heat required to raise the temperature of  1 kg of a substance by  1 ^o K

  The general equation for specific heat is  

                    C = \frac{dU}{dT}

Where dT is the change in temperature

             dU is the change in internal energy

The internal energy is mathematically evaluated as

                       U = 3nk_BT

      Where  k_B is the Boltzmann constant with a value of 1.38*10^{-23} kg \cdot m^2 /s^2 \cdot ^o K

                    T is the room temperature

                      n is the number of atoms in a substance

Generally number of  atoms in mass of an element can be obtained using the mathematical operation

                      n = \frac{m}{M}  * N_A

Where N_A is the Avogadro's number with a constant value of  6.022*10^{23} /  mol

          M is the atomic mass of the element

           m actual mass of the element

  So the number of atoms in 1 kg of copper is evaluated as  

             m = 1 kg = 1 kg *  \frac{10000 g}{1kg }  = 1000g

The number of atom is  

                       n = \frac{1000}{63.6} * (6.0*0^{23})

                          = 9.46*10^{24} \ atoms

Now substituting the equation for internal energy into the equation for specific heat

          C = \frac{d}{dT} (3 n k_B T)

              =3nk_B

Substituting values

         C = 3 (9.46*10^{24} )(1.38 *10^{-23})

            C= 392 J/kg\cdot ^o K

5 0
3 years ago
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