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Morgarella [4.7K]

3 years ago

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A 10 liter flask at 298 K contains a gaseous mixture of O2 and CO2 at 1 atmosphere. Which statement is true for the partial pres

sures of O2 and CO2 if 0.2 mole of O2 is present in the flask? (Given the universal gas constant R = 0.082 L∙atm/K∙mol)

1 answer:

solong [7]3 years ago

8 0

A is correct just compare answers with yahoo

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Consider the reaction CaCN2 + 3 H2O → CaCO3 + 2 NH3 . This reaction has a 75.6% yield. How many moles of CaCN2 are needed to obt

kherson [118]

Answer: Thus 0.724 mol of $CaCN_2$ are needed to obtain 18.6 g of $NH_3$

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of} NH_3=\frac{18.6g}{17g/mol}=1.09moles$

$CaCN_2+3H_2O\rightarrow CaCO_3+2NH_3$

According to stoichiometry :

2 moles of $NH_3$ are produced by = 1 mole of $CaCN_2$

Thus 1.09 moles of $NH_3$ will be produced by = $\frac{1}{2}\times 1.09=0.545moles$ of $CaCN_2$

But as yield of reaction is 75.6 %, the amount of $CaCN_2$ needed is = $\frac{0.545}{75.6}\times 100=0.724$

Thus 0.724 mol of $CaCN_2$ are needed to obtain 18.6 g of $NH_3$

3 0

3 years ago

Within an atom, electrons A. are in motion inside the nucleus. B. are in motion outside the nucleus. C. are inside the nucleus a

marin [14]

Hello! The correct answer is, B. are in motion outside the nucleus.

I hope this helped!

4 0

3 years ago

Read 2 more answers

Which branch science consist of?<br>

Rzqust [24]

Answer:

Modern science is typically divided into three major branches that consist of the natural sciences (biology, chemistry, physics, astronomy and Earth science), which study nature in the broadest sense; the social sciences (e.g. psychology, sociology, economics, history) which study people and societies; and the formal ...

7 0

3 years ago

Read 2 more answers

When 4.15 grams of silver nitrate is reacted with 1.11 grams of iron(III) chloride, which best represents the amount of silver c

PolarNik [594]

Answer:

The mass of silver chloride produced = 2.202 g

Explanation:

Equation of the reaction is given below

3AgNO₃(aq) + FeCl₃(aq) ----> 3AgCl(s) + Fe(NO₃)₃(aq)

molar mass of AgNO₃ = 170 g/mol

molar mass of FeCl₃ = 233.5 g/mol

molar mass of AgCl = 143.5 g/mol

3 moles of silver nitrate reacts with 1 mole of iron (iii) chloride to give 3 moles of silver nitrate

4.15 grams of AgNO₃ = 4.15/170 = 0.0244 moles of AgNO₃

1.11 grams of FeCl₃ = 1.11/233.5 = 0.0047 moles of FeCl₃

mole ratio of AgNO₃ to FeCl₃ = 0.0244/0.0047 = 5 : 1

therefore, FeCl₃ is the limiting reactant

0.0047 moles of FeCl₃ reacting will produce 0.0047 * 3 moles of AgCl = 0.0141 moles of AgCl

0.0141 moles of AgCl = 0.0141 * 143.5 g of AgCl = 2.02 g of AgCl =

Therefore mass of silver chloride produced = 2.202 g

3 0

3 years ago

Suppose that in an ionic compound, "m" represents a metal that could form more than one type of ion. in the formula mf2 , the ch

geniusboy [140]

F (Fluorine) is in column (group/family) VIIA, or the "halogens". When you see the halogens (Fluorine, Chlorine, Bromine, and Iodine) in combination with a metal, each halogen atom present will carry a -1 charge. We can see that the atom has no charge, so the metal must cancel out the negative charges brought by the two fluorine atoms.
(Charge on m) + 2*(charge on fluorine) = 0
(Charge on m) + 2*(-1) = 0
(Charge on m) - 2 = 0
Charge on m ion = +2

3 0

3 years ago