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lawyer [7]
3 years ago
8

In a rush, a student only measured the mass of the empty beaker once before beginning

Chemistry
1 answer:
natulia [17]3 years ago
6 0

Answer:

The student measured the cup and got an incorrect answer

Explanation:

because he was in a rush.

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Calculate molecules in 1dm^3 of oxygen
Archy [21]

Number of molecules in 1 dm³ Oxygen = 2.71 x 10²²

<h3>Further explanation</h3>

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

1 dm³ of oxygen = 1 L Oxygen

  • mol Oxygen :

\tt \dfrac{1}{22.4}=0.045`mol

  • molecules of Oxygen :

n=mol=0.045

No = 6.02.10²³

\tt N=n\times No\\\\N=0.045\times 6.02\times 10^{23}\\\\N=2.71\times 10^{22}

5 0
3 years ago
List at least 15 important events in the science of Astronomy. Include a description of the event including the year and what cu
lbvjy [14]
The Big Bang probably occurred.
~30,000 B.C. North America Asian hunter-gatherers had crossed over the frozen Bering Strait to become first humans in North America.
~10,000 B.C. South America Those who crossed over on Bering Strait into North America had traveled as far south as Argentina by this point.
~6,000 B.C. Europe End of land bridge between Britain and continental Europe. Britain becomes an island.
~4,500 B.C. Brittany (France) The megalithic structures of Carnac were built.
~3,500 B.C. Wales Pentre Ifan is built.
~3,200 B.C. Ireland The Newgrange tomb is built.
7 0
4 years ago
Read 2 more answers
How many moles of H2O will be produced from 42.0g of H2O2
IceJOKER [234]

Answer : The number of moles of water will be, 1.235 moles

Solution : Given,

Mass of H_2O_2 = 42 grams

Molar mass of H_2O_2 = 34 g/mole

First we have to calculate the moles of H_2O_2

\text{Moles of }H_2O_2=\frac{\text{Mass of }H_2O_2}{\text{Molar mass of }H_2O_2}=\frac{42g}{34g/mole}=1.235moles

Now we have to calculate the moles of water.

The balanced chemical reaction will be,

2H_2O_2\rightarrow 2H_2O+O_2

From the balanced reaction, we conclude that

As, 2 moles of H_2O_2 decomposes to give 2 moles of water

So, 1.235 moles of H_2O_2 decomposes to give 1.235 moles of water

Therefore, the number of moles of water will be, 1.235 moles

8 0
3 years ago
Based on their activation energies and energy changes and assuming that all collision factors are the same, which of the followi
babymother [125]

b is fastest, having the lowest activation energy (35 kJ) and is an exothermic reaction, releasing energy in the form of heat

c is slowest, having the highest activation energy (55 kJ) and is an endothermic reaction, taking in energy from its surroundings

5 0
3 years ago
A ball was massed in a dish. The total mass was 15.6 grams. Treball was placed in a
iVinArrow [24]

Answer:

14.57g

Explanation:

Given parameters:

Mass of dish + ball  = 15.6g

Initial volume of water in the cylinder  = 26.7mL  

Final volume of water in the cylinder  = 38.9mL

Mass of dish = ?

Unknown

Mass of the ball = ?

Solution;

 Since the mass of ball and dish is 15.6g,

 Mass of the ball  =Mass of ball + dish  - mass of the dish

 Insert the parameters and solve;

 Mass of the ball  = 15.6g  - 1.03g  = 14.57g

3 0
3 years ago
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