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IrinaK [193]
2 years ago
11

A solid is 5 cm tall, 3 am wide, and 2 cm thick. It has a mass of 135 g. What is the solid's density?

Chemistry
1 answer:
gizmo_the_mogwai [7]2 years ago
4 0

<u>Answer:</u>

density of solid = 4.5 g/cm³

<u>Explanation:</u>

density = mass ÷ volume

• We know the mass of the object (135 g). We need to calculate the volume:

Volume = length × width × thickness

             = 5 cm × 3 cm × 2 cm

             = 30 cm³

• Now we can calculate the solid's density:

density = 135 g ÷ 30 cm³

            = 4.5 g/cm³

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svlad2 [7]

Answer:

\boxed {\boxed {\sf  A. \ 19,320 \ kg/m^3}}

Explanation:

We want to find the density. The formula is mass over volume.

\rho = \frac{m}{v}

The mass is 500 kilograms. The volume is 0.026 cubic meters.

m= 500 \ kg \\v=0.026 \ m^3

Substitute the values into the formula.

\rho= \frac{ 500 \ kg}{ 0.026 \ m^3}

Divide.

\rho = 19230.7692 \ kg/m^3

This is just about equal to 19,320 kg/m³, so choice A is correct.

3 0
3 years ago
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What is the molecularity of the following elementary reaction?
Pani-rosa [81]

Answer : The correct option is, (B) bimolecular

Explanation :

Molecularity : It is defined as the total number of reactant molecules taking part in the balanced equation of a reaction. It is a theoretical concept.

The given balanced chemical reaction is,

NH_2Cl(aq)+OH^-(aq)\rightarrow NHCl^-(aq)+H_2O(l)

The number of reactants molecules taking part in the balanced equation of a reaction are, NH_2Cl and OH^-.

In this reaction, 1 NH_2Cl molecules reacts with the 1 OH^- molecule.

Total number of reactant molecule = 1 + 1 = 2

The molecularity of the reaction is 2 that means, the elementary reaction is bimolecular.

Hence, the correct option is, (B) bimolecular

7 0
3 years ago
What is ΔG° at 298 K for the following equilibrium? Ag+(aq) + 2NH3(aq) Ag(NH3)2+(aq); Kf = 1.7 × 107 at 298 K a. 41 kJ b. 0 c. –
jekas [21]

Answer:

ΔG° = 41.248 KJ/mol (298 K); the correct answer is a) 41 KJ

Explanation:

Ag+(aq)  +  2NH3(aq)  ↔ Ag(NH3)2+(aq)

⇒ Kf = 1.7 E7; T =298K  

⇒ ΔG° = - RT Ln Kf.....for aqueous solutions

∴ R = 8.314 J/mol.K

⇒ ΔG° = - ( 8.314 J/mol.K ) * ( 278 K ) ln ( 1.7 E7 )

⇒ ΔG° = 41248.41 J/mol * ( KJ / 1000J )

⇒ ΔG° = 41.248 KJ/mol

7 0
3 years ago
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As you have seen in this lab, the density of water is near 1 g/cm3. Anything with a density lower than this will float in water,
hammer [34]
The third answer is the one you want. You have to have an adjustable density. All other things being equal, if the tanks you use for holding just water when filled with water will let the sub sink, because the sub is made of a dense metal like iron or steel.

If on the other hand you fill these tanks with air, the net density will be below one and the sub will rise.
8 0
3 years ago
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Lisa needs to buy a helium tank to fill up all the balloons. If the helium must be compressed from an original volume of 27.0L a
algol13

Answer:

P_2=135.73psi

Explanation:

Hello,

In this case we use the Boyle's law which allows us to understand the volume-pressure behavior as an inversely proportional relationship:

V_1P_1=V_2P_2

Whereas we solve for P_2 as the required final pressure:

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Best regards.

7 0
3 years ago
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