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coldgirl [10]
3 years ago
14

Determine the identity of a cube of metal that measures 1.5 cm on each side and has a mass of 35.45g.

Chemistry
2 answers:
Ainat [17]3 years ago
7 0

Answer:10.501

Explanation:

Troyanec [42]3 years ago
3 0
The word identity is a mistake. The question asks for the density of a cube of metal with the measures and mass given.

Density = mass / volume

mass = 35.45 g

volume of a cube = (length of the side) ^ 3 = (1.5 cm)^3 = 3.375 cm^3

Density = 35.45 g / 3.375 cm^3 = 10.50 g / cm^3.

Answer: 10.50 g / cm^3
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The decomposition of dinitrogen pentoxide, N2O5, to NO2 and O2 is a first-order reaction. At 60°C, the rate constant is 2.8 × 10
Ugo [173]

Answer:

The correct option is a.

Explanation:

2N_2O_5\rightarrow 4NO_2 + O_2

125 kPa

125kpa - 2x                            4x    x

Total pressure after reaction = 176 kPa

125 kPa - 2x + 4x + x = 176 kPa

x = 17

125 kpa - 2x = 125 kPa - 2(17) = 91 kPa

Initial pressure of the dinitrogen pentoxide ,(at t=0) =P_o= 125 kPa

Final pressure of the dinitrogen pentoxide, (at t = t) = P = 91 kPa

The rate constant is = k = 2.8\times 10^{-3} min^{-1}

t=\frac{2.303}{k}\log\frac{P_o}{P}

t=\frac{2.303}{2.8\times 10^{-3} min^{-1}}\log\frac{125 kPa}{91 kPa}

t=113.3969 minutes\approx 113 minutes

It will take 113 minutes for the total pressure to reach 176 kPa.

8 0
3 years ago
Alcano con 1 carbono?
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5 0
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Magnesium (average atomic mass = 24.3050 amu) consists of three isotopes with masses 23.9850 amu, 24.9858 amu, and 25.9826 amu.
iris [78.8K]

Answer: The first isotope has a relative abundance of 79% and last isotope has a relative abundance of 11%

Explanation: Given that the average atomic mass(M) of magnesium

= 24.3050amu

Mass of first isotope (M1) = 23.9850amu

Mass of middle isotope (M2)=24.9858amu

Mass of last isotope(M3)= 25.9826amu

Total abundance = 1

Abundance of middle isotope = 0.10

Let abundance of first and last isotope be x and y respectively.

x+0.10+y =1

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M = M1 × % abundance of first isotope + M2 × % of middle isotope +M3 ×% of last isotope

24.03050= 23.985× x + 24.9858 ×0.10 + 25.9826×y

Substitute x= 0.90-y

Then

y = 0.11

Since y=0.11, then

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5 0
3 years ago
What are the advantages of using digital signals over analog signals?
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in digital signals, codes are used while in analogue signals do not use signals.

<h3>What are signals?</h3>

Signals are defined as the instructions which are transferred to another source in other to deliver a message.

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The digital signals uses codes which is a secret way of sending messages while analogue doesn't use codes.

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4 0
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Answer:

The products  of self-ionization of water are OH⁻ and H⁺.

Explanation:

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<em></em>

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Kw is also called "self-ionization constant" or "auto-ionization constant".

6 0
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