Convert 44 centimeters to meters. A. 4 m B. 4.4 m C. 0.44 m D. 0.044 m

5.5x10² – 6.50x10' Express the calculation in correct significant digits

OLga [1]

Answer:

$6.15x10^2$

Explanation:

Hello!

In this case, when performing mathematical operations with numbers in scientific notation, the first step is to write them in standard notation:

550 - 65.0

Thus, the result without any significant figures-based analysis is:

615.0

However, since 550 is significant to the ones and 65.0 to the tenths, we need to round the result to the bigger significance, in this case to the ones; therefore the appropriate result would be:

615

That in scientific notation would be:

$6.15x10^2$

Best regards!

5 0

3 years ago

Equal molar amounts of H2 and I2 are placed into an evacuated container and heated to 445°C, where the following equilibrium is

Rus_ich [418]

Answer: The initial concentration of $H_2\text{ and }I_2$ are 0.0192 M and 0.0192 M respectively.

Explanation:

We are given:

Equilibrium concentration of HI = 0.030 M

Moles of hydrogen gas = Moles of iodine gas (concentration will also be the same)

For the given chemical equation:

$H_2+I_2\rightleftharpoons 2HI$

Initial: x x -

At eqllm: x-c x-c 2c

Calculating the value of 'c'

$2c=0.030\\\\c=\frac{0.030}{2}=0.015M$

The expression of $K_{eq}$ for above reaction follows:

$K_{eq}=\frac{[HI]^2}{[H_2]\times [I_2]}$

We are given:

$K_{eq}=50.2$

$[H_2]=(x-c)=(x-0.015)$

$[I_2]=(x-c)=(x-0.015)$

Putting values in above equation, we get:

$50.2=\frac{(0.030)^2}{(x-0.015)\times (x-0.015)}\\\\x=0.0108,0.0192$

Neglecting the value of x = 0.0108 M, because the initial concentration cannot be less than the equilibrium concentration.

x = 0.0192 M

Hence, the initial concentration of $H_2\text{ and }I_2$ are 0.0192 M and 0.0192 M respectively.

5 0

3 years ago

1. Calculate the average reaction rate expressed in moles H2 consumed per liter per second.

valentina_108 [34]

Answer:

1) 0.0025 mol/L.s.

2) 0.0025 mol/L.s.

Explanation:

For the reaction:

H₂ + Cl₂ → 2HCl.

The average reaction rate = - Δ[H₂]/Δt = - Δ[Cl₂]/Δt = 1/2 Δ[HCl]/Δt

1. Calculate the average reaction rate expressed in moles H₂ consumed per liter per second.

The average reaction rate expressed in moles H₂ consumed per liter per second = - Δ[H₂]/Δt = - (0.02 M - 0.03 M)/(4.0 s) = 0.0025 mol/L.s.

2. Calculate the average reaction rate expressed in moles CI₂ consumed per liter per second.

The average reaction rate expressed in moles Cl₂ consumed per liter per second = - Δ[Cl₂]/Δt = - (0.04 M - 0.05 M)/(4.0 s) = 0.0025 mol/L.s.

7 0

3 years ago

Benzene is a starting material in the synthesis of nylon fibers and polystyrene (styrofoam). Its specific heat capacity is 1.74

katovenus [111]

Answer:

D

Explanation:

The amount of energy released or absorbed is equal the product of the mass, the specific heat capacity and the temperature change. The temperature change being the difference between the final and initial temperature.

Q = mc∆T

Q = heat energy (Joules, J) m = mass of a substance (kg) c = specific heat (units J/g∙K)

∆ is a symbol meaning "the change in" ∆T = change in temperature (Kelvins, K)

From the data provided in the question, we can deduce that:

Q = 16.7KJ = 16,700J

m = 225g

c = 1.74J/g.k

For the temperature, let the final temperature be f. This means our ∆T = f - 20

16,700 = 225 * 1.74 * (f - 20)

16700 = 391.5 (f - 20)

f - 20 = 16700/391.5

f - 20 = 42.7

f = 20 + 42.7 = 62.7

Hence the final temperature is 62.7 degrees Celsius

6 0

4 years ago

The first step in the two-step process of making a solution is the breakdown of the solute source into ____________."

Troyanec [42]

<h3>Answer;</h3>

Atomic particles

The first step in the two-step process of making a solution is the breakdown of the solute source into atomic particles.

<h3>Explanation;</h3>

Solution is a homogeneous mixture of two or more substances uniformly dispersed throughout a single phase
The liquid component that makes up the largest part of a solution is called the solvent, and the substance that is dissolved is called the solute.
Unsaturated Solution is a solution that contains less solute than a saturated solution does and that is able to dissolve additional solute, while saturated Solution is a solution that cannot dissolve any more solute under the given conditions

7 0

3 years ago