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Cloud [144]
3 years ago
15

How many molecules are in 8.55x10-15 moles of a substance

Chemistry
1 answer:
solniwko [45]3 years ago
6 0

Answer:

Know this

1mole of a substance contains 6.022x10²³molecules

Now

8.55x10^-15moles x 6.022x10²³molecules/1mole

=5.15x10^9molecules.

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Which of the following best predicts the outcome of a fusion reaction involving isotopes of hydrogen?
blagie [28]
The correct answer would be the second option. The outcome of a fusion reaction which involves isotopes of hydrogen would be the nuclei of the hydrogen isotopes join together to form a heavier element, and energy is released. A fusion reaction is a nuclear reaction which involves at least two nuclei or atoms combining forming products that are heavier than the reactants. Along with the formation of a new atomic nuclei, energy is released. Fusion of two isotopes of hydrogen, specifically deuterium and tritium, results to the formation of a neutron and a helium-3 atom atom. This reaction happens in the core of the Sun.
4 0
4 years ago
How many mole of chlorine gas react with 0.100 mol of metal iron?<br> Fe+Cl2-&gt; FeCl2
satela [25.4K]
                       2 mol Cl
.100 mol Fe  x ------------- = .05 mol Cl
                        1 mol Fe 
3 0
3 years ago
A chemist has a 12.5 liter sample of neon gas at 1.00 atm and 30 c. If the chemist compresses the sample to 10.5 liters and hold
ycow [4]

Answer:

254.5 K

Explanation:

Data Given

initial volume V1 of neon gas = 12.5 L

final Volume V2 of neon gas = 10.5 L

initial Temperature T1 of neon gas = 30 °C

convert Temperature to Kelvin

T1 = °C +273

T1 = 30°C + 273 = 303 K

final Temperature T2 of neon gas = ?

Solution:

This problem will be solved by using Charles' law equation at constant pressure.

The formula used

                        V1 / T1 = V2 / T2

As we have to find out Temperature, so rearrange the above equation

                       T2 = V2 x T1 / V1

Put value from the data given

T2 = 10.5 L x 303 K / 12.5 L

T2 = 254.5K

So the final Temperature of neon gas = 254.5 K

8 0
3 years ago
N yogurt de 125 g muestra en su etiqueta el contenido de algunas de sus sustancias nutricionales:¿Cuál es la composición en tant
poizon [28]

Answer:

Sustancia  Masa (g)  Composición (% m/m)

<em>Proteínas</em>      5,5                  4,4

<em>Azúcares</em>      5,0                  4,0

<em>Sodio            </em>0,06               0,048

<em>Potasio         </em>0,15                 0,12

                         

Explanation:

Para calcular la composición porcentual en masa de las sustancias debemos usar la siguiente ecuación:

\%_{m/m} = \frac{m_{s}}{m_{sol}} \times 100

En donde:

m_{s} es la masa de la sustancia

m_{sol} es la masa del yogurt = 125 g

Para las proteínas:

\%_{m/m} = \frac{m_{s}}{m_{sol}} \times 100 = \frac{5,5 g}{125 g} \times 100 = 4,4 \%

Para los azúcares:

\%_{m/m} = \frac{5,0 g}{125 g} \times 100 = 4,0 \%

Para el sodio:

\%_{m/m} = \frac{0,06 g}{125 g} \times 100 = 0,048 \%

Para el potasio:

\%_{m/m} = \frac{0,15 g}{125 g} \times 100 = 0,12 \%

Espero que te sea de utilidad!    

6 0
3 years ago
1. Replace ? with a whole number to make the statements true.
Ira Lisetskai [31]
<span>1.) a. 20 ÷ 4 ? means ? × 4 = 20     </span>→ replace ? with 5.<span>
b. 2,725 ÷ 5 ? means ? × 5 = 2,725  </span>→ replace ? with 545<span>
c. ? ÷ 5 = 0 </span>→ replace ? with 0.

2) 1,475 / 25 = 59
They used 59 boxes for this year.

3) 18 per haircut ; 70 per perm
4,608 = 18h + 70(36)
4,608 - 2,520 = 18h
2,088 = 18h
2,088/18 = h
116 = h
Grace did 116 haircuts.

4) 575 + 13(118) = 575 + 1,534 = 2,109 total expense.

5) 2,240 miles / 320 miles = 7 tanks of gas used.
7 tanks * 39 = 273 cost of the gas used.

5 0
4 years ago
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