Use the exponential notation to express the physical quantities<br> (a) V = 15.50 mL to L

For the reaction, calculate how many moles of the product form when 0.016mol of O2 completely reacts. . Assume that there is mor

Oksi-84 [34.3K]

The balanced reaction is given as:

<span>2Ca(s)+O2(g)→2CaO(s)
</span>
We are given the amount of oxygen gas to be used for the reaction. This will be the starting point of our calculations.

0.016 mol O2 ( 2 mol CaO / 1 mol O2 ) = 0.032 mol CaO

<span>Therefore, for the reaction, the amount of calcium oxide produced is 0.032 moles.</span>

4 0

3 years ago

The illuminance on a surface is 6 lux and the surface is 4 meters from the light source. What is the intensity of the source?

Elza [17]

The correct answer is:

D. 96 candelas

7 0

4 years ago

Read 2 more answers

Which of the following halogens is darkest in colour?

Naddik [55]

I₂ is the halogens which is darkest in colour than other.

<h3>What is halogen? </h3>

Halogens are the elements which belongs to group 17. Group 17 elements are known as halogens. They are highly electronegative in nature.

The last electronic configuration is ns2 np5. Since, one electron is less to get stable electronic configuration. Therefore, they accept one electron and get stable electronic configuration.

<h3>Why halogens are dark in colour? </h3>

As we move down the group, the darkness of colour increases. This is due to ionization energy which decreases as we move down the group. This is due to increase in the atomic size and decrease in nuclear form which further make high energy level to absorb lesser light and reflects deepen colour on moving down the group. Due to which they appears dark. Therefore, option A is the correct option.

Thus, we can concluded that I₂ is the halogens which is darkest in colour than other.

learn more about Halogens:

brainly.com/question/11156152

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6 0

2 years ago

Is nitrogen an elementary substance or a compound

Charra [1.4K]

Answer:

Nitrogen (N2) are not compounds because each is composed of a single element.

7 0

4 years ago

Copper has two naturally occurring isotopes, 63Cu Gsotopic mass 629396 arnu) and 65Cu Osotopic mass 64.9278 amu). If copper has

madam [21]

<u>Answer:</u> The percentage abundance of $_{29}^{63}\textrm{Cu}$ and $_{29}^{65}\textrm{Cu}$ isotopes are 75.77% and 24.23% respectively

<u>Explanation:</u>

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

Let the fractional abundance of $_{29}^{63}\textrm{Cu}$ isotope be 'x'. So, fractional abundance of $_{29}^{63}\textrm{Cu}$ isotope will be '1 - x'

<u>For $_{29}^{63}\textrm{Cu}$ isotope:</u>

Mass of $_{29}^{63}\textrm{Cu}$ isotope = 62.9396 amu

Fractional abundance of $_{29}^{63}\textrm{Cu}$ isotope = x

<u>For $_{29}^{65}\textrm{Cu}$ isotope:</u>

Mass of $_{29}^{65}\textrm{Cu}$ isotope = 64.9278 amu

Fractional abundance of $_{29}^{65}\textrm{Cu}$ isotope = 1 - x

Average atomic mass of copper = 63.546 amu

Putting values in equation 1, we get:

$63.546=[(62.9396\times x)+(64.9278\times (1-x))]\\\\x=0.6950$

Percentage abundance of $_{29}^{63}\textrm{Cu}$ isotope = $0.6950\times 100=69.50\%$

Percentage abundance of $_{29}^{65}\textrm{Cu}$ isotope = $(1-0.6950)=0.305\times 100=30.50\%$

Hence, the percentage abundance of $_{29}^{63}\textrm{Cu}$ and $_{29}^{65}\textrm{Cu}$ isotopes are 69.50% and 30.50% respectively.

4 0

3 years ago

Use the exponential notation to express the physical quantities (a) V = 15.50 mL to L