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prisoha [69]
3 years ago
7

A tiny pencil mark just visible to the naked eye contains about 3 × 1017 atoms of carbon. what is the mass of this pencil mark i

n grams?
Chemistry
1 answer:
Vera_Pavlovna [14]3 years ago
6 0
<span>The number of carbon atoms in the pencil mark is 3X1017 atoms of carbon The atomic weight of carbon is 12.01 amu, so 12.01 g of carbon contains 6.022X1023 atoms. Thus equation: 12.01 g carbon/ 6.022 X 1023 atoms (3X1017 atoms) (12.01 g carbon/ 6.022X1023 atoms) - the atoms cancel out (3X1017) (12.01g carbon/6.022X1023) divide and multiply = 6x10-6g carbon The mass of this pencil mark in grams is 6x10-6g carbon</span>
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The pressure is recorded as 738 mmHg.Convert this measurement to atmosphere (atm)
garri49 [273]
As we know that 760 mmHg is equal to 1 atm.

So,
If 760 mmHg is equal to   =   1 atm
Then
738 mmHg will be equal to   =   X atm

Solving for X,
                                X   =   (738 mmHg × 1 atm) ÷ 760 mmHg

                                X   =   0.971 atm

Result:
           738 mmHg
is equal to 0.971 atm.
4 0
3 years ago
Which of the following is the correct formula for Ca2+ reacting with NO2??
mariarad [96]

Answer:

B. Ca(NO2)2

Explanation:

Ions (charged atoms) combine with one another to form stable ionic compounds. In this case, calicium ion (Ca2+) is said to react with NO2, which has a charge of -1 i.e. +1-1(2) = 1-2 = -1.

This means that calcium has a charge of +2 while nitrite ion has charge of -1, hence, when they combine, they exchange their charges, which become their subscript as follows:

Ca2+ + NO2- → Ca(NO2)2

Ca(NO2)2 is a stable ionic compound called calcium nitrite. Notice that it takes two atoms of NO2- to react with one atom of Ca2+.

5 0
3 years ago
If 200.4g of water is mixed with 101.42g of salt the mass of the final solution would be reported as
d1i1m1o1n [39]

Answer:

301.8 g

Explanation:

We prepare a solution with 200.4 g of water (solvent) and 101.42 g of salt (solute). The mass of the solution is equal to the sum of the mass of the solvent and the mass of the solute.

m(solution) = m(solute) + m(solvent)

m(solution) = 200.4 g + 101.42 g

m(solution) = 301.8 g (we round-off to one decimal according to the significant figures rules)

8 0
3 years ago
Which particle has a mass of approximately 1 atomic mass unit?
labwork [276]
The answer is D) a neutron.

When we say an atom's mass is, like 5 atomic mass units actually we are saying that the total number of the neutrons and protons in its nucleus is 5.

The mass of a neutron and a proton is each one atomic mass unit.

Mass of a neutron is approximately 1 atomic mass unit.
7 0
3 years ago
The isotope 106 46Pd (106 on top and 46 on bottom)
vazorg [7]

Answer:

4. 60 neutrons.

Explanation:

The given isotopes;

         ¹⁰⁶₄₆Pd

In this isotope, we can deduce that the mass number is the superscript and the atomic number is the subscript;

     Mass number  = 106

     Atomic number  = 46

Mass number is the number of protons and neutrons in an atom;

       Mass number = Protons + neutrons

Atomic number is the number of protons

   

So,  Number of protons  = 46

Number of neutrons  = Mass number  - Atomic number

                                    = 106  - 46

                                     = 60

Number of neutrons  = 60

7 0
3 years ago
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