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3 years ago

Can someone plz help fill in these coefficients 4., 5., 6., 7.

Chemistry

1 answer:

dexar [7]3 years ago

8 0

Start by balancing elements that don’t appear in single form. So, for number 4

Start by adding 2 to Cu2O to balance the oxygen

2Cu2O + C —-> Cu + CO2

Now the oxygen is balanced, but the Cu is not. This can now simply be mitigated by adding 2 to the single Cu

2Cu2O + C —-> 2Cu + CO2

That’s your final answer for #4

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Isotopes of carbon differ with the respect to the number of

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Answer:

Neutrons.

Explanation:

Isotopes can be defined as the atom of an element that has the same number of protons but different number of neutrons. This ultimately implies that, the isotopes of an element have the same atomic number (number of protons) but different atomic mass (number of nucleons).

The isotope of an element is denoted by $X^{A}_{Z}$

Where; X is the symbol of the element.

A is the atomic mass or number of nucleons.

Z is the atomic number or number of protons.

Therefore, the number of neutrons = A - Z

Isotopes of carbon differ with respect to the number of neutrons.

Basically, there are three (3) Isotopes of Carbon and these are;

1. Carbon-12: it has an atomic mass of 12 with 6 numbers of proton and neutron respectively.

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3. Carbon-14: it has an atomic mass of 14 with 6 numbers of proton and 8 numbers of neutron.

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3 years ago

Concentrated hydrochloric acid is made by pumping hydrogen chloride gas into distilled water. If concentrated HCl contains 439 g

Elza [17]

Answer:

12.10 mol / 1 L

Explanation:

Molarity of a substance , is the number of moles present in a liter of solution .

M = n / V

M = molarity ( unit = mol / L or M )

V = volume of solution in liter ( unit = L ),

n = moles of solute ( unit = mol ),

Moles is denoted by given mass divided by the molecular mass ,

Hence ,

n = w / m

n = moles ,

w = given mass ,

m = molecular mass .

From the question ,

The data given is as follows -

w = 439 g

As , we known for HCl ,

m = 36.46 g/mol

V = 1 L

From the above data ,

Moles are given as -

n = w / m

n = 439 / 36.26 = 12.10 mol ,

Now , the molarity is given as ,

M = n / V

M = 12.10 mol / 1 L

M = 12.10 mol /L

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2 years ago