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inna [77]
3 years ago
8

A substance has a mass of 61.9 g and its volume is 5.45 cm3, what is the density?

Chemistry
1 answer:
fredd [130]3 years ago
7 0
Density= 11.3578 g/cm^3
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What is the molarity of 10.0 g of NaCl dissolved in water to make 100. mL?
tigry1 [53]

Answer:

=<em><u> 1.7 M</u></em>

Explanation:

Molecular mass of NaCl = ( 23+35.5 ) = 58.5g

58.5g of NaCl are weighed by 1 mole of NaCl

10.0g of NaCl will be weighed by ( 10÷58.5 )

<em> <u>= 0.17 moles of </u><u>NaCl</u></em>

100mL = ( 100÷1000)L = 0.1L

0.1L of a solution is occupied by 0.17 moles of NaCl

<u>1L</u> of solution will be occupied by [(1÷0.1)×0.17]

=<em><u>1</u></em><em><u>.</u></em><em><u>7</u></em><em><u> </u></em><em><u>M</u></em>

5 0
4 years ago
What elements are in NaC2HO4 and how many atoms are in each element​
JulijaS [17]

Answer:

Each molecule contains one atom of A and one atom of B. The reaction does not use all of the atoms to form compounds.

                 A + B ⟶ Product

Particles: 6      8              6

If six A atoms form six product molecules, each molecule can contain only one A atom.

The formula of the product is ABₙ.

If n = 1, we need six atoms of B.

If n = 2, we need 12 atoms of B. However, we have only eight atoms of B, so the formula of the product must be AB.

Thus, 6A + 6B ⟶ 6AB, with two B atoms left over.

Explanation:

Credit goes to @znk

Hope it helps you :))

7 0
3 years ago
What is the wavelength of a microwave with a frequency of 2450 mhz
JulsSmile [24]

Answer:

See below

Explanation:

The way to calculate this

  speed of light =  wavelength * frequency

   3 x 10 ^8 m/s   =   wavelength * 2450000000 Hz

       wavelength = .12245 meters

                    = 1.2245 x 10^-1  Meters  

6 0
2 years ago
Select the statements that correctly describe an asteroid. Check all that apply
stich3 [128]

Answer:

Explanation:

Most of this ancient space rubble can be found orbiting the Sun between Mars and Jupiter within the main asteroid belt. Asteroids range in size from Vesta – the largest at about 329 miles (530 kilometers) in diameter – to bodies that are less than 33 feet (10 meters) across.

5 0
3 years ago
Which of the following are isoelectronic?
OleMash [197]

Answer:

The correct answer is option C.

Explanation:

Isoelectronic species are those atoms or ions which same number of electrons.But they differ in physical and chemical properties.

Atomic number of nitrogen atom is 7.

[N]=1s^22s^22p^3

[N]^{3-}=1s^22s^22p^6

Number electron in nitride ions = N^{3-}=10

Atomic number of oxygen atom is 8.

[O]=1s^22s^22p^4

[O]^{2-}=1s^22s^22p^6

Number electron in oxide ions = O^{2-}=10

[Ne]=1s^22s^22p^6

Number of electrons neon = Ne=10

Hence, N^{3-} , O^{2-} \& Ne are isoelectronic.

7 0
4 years ago
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