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scoray [572]
4 years ago
13

1,645.6 expressed in scientific notation equals?

Chemistry
2 answers:
12345 [234]4 years ago
8 0
1.6456 x 10^3 (ten to the third power)
gizmo_the_mogwai [7]4 years ago
6 0

Answer : The correct representation is, 1.6456\times 10^{3}

Explanation :

Scientific notation : It is defined as the method or a way or representation of expressing the given number which are too big or too small that is written in the decimal form. That means, it always written in the power of 10 form.

For example : 8000 is written as, 8\times 10^3

As we are given the digit which is, 1645.6

This number is written in scientific notation as :

1.6456\times 10^{3}

Therefore, the correct representation is, 1.6456\times 10^{3}

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Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( = 184.2 g/mol) is one of the simplest of these drug
DanielleElmas [232]

Answer:

118.75°C is the boiling point of a solution.

Explanation:

Mass of the solute that is barbiturates = 42.5 g

Molar mass of a solute = 184.2 g/mol

Moles of solute = \frac{42.5 g}{184.2 g/mol}=0.2307 mol

Mass of the solvent that acetic acid = 825 g = 0.825 kg

molality=\frac{\text{Moles of solute}}{\text{Mass of solvent}}

Molality of the solution (m):

m=\frac{0.2307 mol}{0.825 kg}=0.2796 m

Elevation in boiling point is given as:

\Delta T_b=i\times K_b\times m

i = 1 (organic compound)

=1\times 3.07^oC/m\times 0.2796 m=0.8585^oC

\Delta T_b=T_b-T

T_b = Boiling temperature of solution.

T = boiling temperature of solvent that is acetic acid=117.9°C

0.8585^oC=T_b-117.9^oC

T_b=118.75 ^oC

118.75°C is the boiling point of a solution.

6 0
3 years ago
Differentiate between acids and bases on the basis of their pH values.
kompoz [17]

Answer:

acid; there ph value is mostly 7

base: there ph value can be more than 7 or less than 7

4 0
3 years ago
Read 2 more answers
A sample of air at 58.6 kPa is expanded from 250 mL to 655 mL. If thetemperature remains constant, what is the final pressure in
kati45 [8]

Answer:

<h2>22.366 kPa</h2>

Explanation:

The final pressure can be found by using the formula for Boyle's law which is

P_1V_1 = P_2V_2

Since we are finding the final pressure

P_2 =  \frac{P_1V_1}{V_2}  \\

From the question

58.6 kPa = 58600 Pa

We have

P_2 =  \frac{58600 \times 250}{655}  =  \frac{14650000}{655}  \\  = 22366.4122... \\  = 22366

We have the final answer as

<h3>22.366 kPa</h3>

Hope this helps you

3 0
3 years ago
A substance produces a solution with negative compounds when mixed with water.\
Liono4ka [1.6K]

Answer:

umm...   the 3 one

Explanation:

hope im right

8 0
3 years ago
Please help ASAP!! I’m stuck!!
Gnoma [55]

Answer:

The answer of this question is 3

8 0
3 years ago
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