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3 years ago

12.4 g of phosphorus reacts with 9.6 g of oxygen.

Chemistry

1 answer:

vaieri [72.5K]3 years ago

7 0

Answer:

D 4P +3O₂ → 2 P₂O₃

Explanation:

In this problem, we need to convert the mass of phosphorus and oxygen to moles trying to find the ratio of reaction (The moles of P that reacts per mole of O₂):

<em>Moles P:</em>

12.4g P * (1mol P / 31g) = 0.4 moles

<em>Moles O₂:</em>

9.6g * (1mol / 32g) = 0.3 moles

The ratio of reaction is:

0.4 mol / 0.3 mol = 1.33 = 4 moles of P / 3 moles of O₂

That means 4 moles of P react with 3 moles of O₂ and the reaction that represents this ratio is:

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Epinephrine (adrenaline) is a hormone secreted into the bloodstream in times of stress. It contains 59.0% C, 7.15% H, 26.20% O,

vichka [17]

Answer:

C9H13O3N

Explanation:

Take the atomic mass of C=12.0, H=1.0, O=16.0 and N=14.0.

We can draw a chart (please view this on desktop so to avoid spacing errors):

Let the mass of Epinephrine be 100g.

C H O N

mass(g) : 59 7.15 26.2 7.65

no. of moles : 59/12 =4.9167 7.15/1 = 7.15 26.2/16=1.6375 7.65/14=0.5464

(n.o.m. = mass/molar mass)

Ratio: 4.9167/0.5464 =9 7.15/0.5464=13 1.6375= 3 0.5464/0.5464 =1

(divide the n.o.m. by the smallest n.o.m., which is 0.5464 in this case, take the whole numbers)

So, the empirical formula will be: C9H13O3N

But this is still not yet the molecular formula. We have to ensure the molar mass is 183g/mol. Multiply the empirical formula by n.

So, let the molecular formula of Epinephrine be (C9H13O3N)n.

12x9n + 1x13n + 16x3n + 14n = 183

108n + 13n + 48n + 14n = 183

183 n = 183.

n = 1

Hence, the molecular formula is C9H13O3N.

3 0

3 years ago

Given 2.14g of B2H6

Shkiper50 [21]

Answer:

(A) is 0.0773 mol B2H6

Explanation:

Questions (A) and (B) are the same.

2.14 g B2H6 x (1 mol B2H6/27.668g B2H6) = 0.0773 mol B2H6 (A)

<u>27.668 is the molar mass of B2H6 calculated from the period table: </u>

(2 x 10.81) + (6 x 1.008) = 27.668

1.008 is the mass of H and 10.81 is the mass of B

(C)

0.0773 mol B2H6 x (6 mol H/ 1 mol B2H6) x (6.022 x 10^23 H atoms/1 mol H)

= 2.79 x 10^23 hydrogen atoms

Further Explanation:

For every 1 mol of B2H6, there are 6 moles of H (indicated by the subscript)

6.022 x 10^23 is Avogrado's number and it equals to 1 mol of anything

Avogrado's number can be in units of atoms, molecules, or particles

5 0

3 years ago

What might your need to add to your soil to help your radishes grow? Explain why.

hram777 [196]

Answer:

For the most part radish seed growth is best when they are planted in cool soil; early spring or fall are the preferred seasons for many varieties. Next, be sure to get the soil in good shape before planting – loose, full of seasoned organic material, but not overly fertile. Moisture and soil depth must be right, too.

Explanation:

5 0

3 years ago

Read 2 more answers

How does latitude affect climate?

Neporo4naja [7]

Answer:

The closer you are to the Equator the hotter the temperature will get, and the further you are from the Equator the colder it will get.

6 0

2 years ago

Ionic bonds form between two negatively charged particles true or false

asambeis [7]

Answer:

FALSE

Explanation:

Ionic bonds are when two atoms of OPPOSITE CHARGE bond together by sharing electrons. For example Na and Cl have opposite charges and they form ionic bonds. Thus two negatively charged particles aren't oppositely charged so they can't be ionic bonds so the statement is FALSE.

4 0

4 years ago