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4 years ago

How many different elements are in the compound sodium carbonate

Chemistry

1 answer:

Alona [7]4 years ago

6 0

Answer:

There are 6 different elements in sodium carbonate

Explanation:

Na - sodium

C - carbon

O - oxygen

Since there are two atoms of Na and three atoms of O

i. e Na2CO3

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5. A study of the system, 4 NH3(g) + 7 O2(g) 2 N2O4(g) + 6 H2O(g), was carried out. A system was prepared with [NH3] = [O2] = 3.

emmasim [6.3K]

Answer: The value of the equilibrium constant, Kc, for the reaction is 0.013

Explanation:

Initial concentration of $NH_3$ = 3.60 M

Initial concentration of $O_2$ = 3.60 M

The given balanced equilibrium reaction is,

$4NH_3(g)+7O_2(g)\rightleftharpoons 2N_2O_4(g)+6H_2O(g)$

Initial conc. 3.60 M 3.60 M 0 M 0 M

At eqm. conc. (3.60-4x) M (3.60-7x) M (2x) M (6x) M

The expression for equilibrium constant for this reaction will be,

$K_c=\frac{[N_2O_4]^2\times [H_2O]^6}{[NH_3]^4\times[Cl_2]}$

$[N_2O_4]=0.60M$

2x = 0.60 M

x= 0.30 M

Now put all the given values in this expression, we get :

$K_c=\frac{(2\times 0.30)^2\times (6\times 0.30)^6}{(3.60-3\times 0.30)^4\times (3.60-7\times 0.30)^7}$

$K_c=0.013$

6 0

3 years ago

What is the theoretical yield of fluorenone if you oxidize 175 mg of fluorene?

My name is Ann [436]

Answer:

602 mg of CO₂ and 94.8 mg of H₂O

Explanation:

The yield is measured by the amount of each product produced by the reaction.

The chemical formula of fluorene is C₁₃H₁₀, and its molar mass is 166.223 g/mol.

The oxidation, also know as combustion, of this hydrocarbon is represented by the following balanced chemical equation:

$2C_{13}H_{10}+31O_2\rightarrow 26CO_2+10H_2O$

To calculate the yield follow these steps:

1. Mole ratio

$2molC_{13}H_{10}:31molO_2:26molCO_2:10molH_2O$

2. Convert 175mg of fluorene to number of moles

$175mg/times 1g/1,000mg=0.175g$

Number of moles = mass in grams / molar mass

$\text{number of moles}=0.175g/166.223g/mol=0.0010528mol$

3. Set a proportion for each product of the reaction

a) For CO₂

i) number of moles

$2molC_{10}H_{13}/26molCO_2=0.0010528molC_{10}H{13}/x$

$x=0.0010528molC_{10}H_{13}\times 26molCO_2/2molC_{10}H_{13}=0.013686molCO_2$

ii) mass in grams

The molar mass of CO₂ is 44.01g/mol

mass = number of moles × molar mass

mass = 0.013686 moles × 44.01 g/mol = 0.602 g = 602mg

b) For H₂O

i) number of moles

$0.0010528molC_{10}H_{13}\times10molH_2O/2molC_{10}H_{13}=0.00526molH_2O$

ii) mass in grams

The molar mass of H₂O is 18.015g/mol

mass = number of moles × molar mass

mass = 0.00526 moles × 18.015 g/mol = 0.0948mg = 94.8 mg

4 0

4 years ago

How many cups are in 4 liters? 1 L=4.2cups

Scilla [17]

Answer:

16.8 cups

Explanation:

We are given that there are 4.2 cups in in 1 liter of a liquid and we are to find out the number of cups that there will be in 4 liters.

To find this out, we will use the ratio method.

We know that:

1 L = 4.2 cups

So we can write it as:

$\frac{1L}{4 L} =\frac{4.2 cups}{x}$

$x = 4 .2 \times 4$

$x = 1 6 . 8$

Therefore, there are 16.8 cups in 4 liters.

4 0

3 years ago

What do all of these things have in common? ______________________________ Bird, dog, tree, person, flower, grass, bacteria, cat

olga2289 [7]

They are all part of the biosphere?

5 0

3 years ago

Which of the following is released during cellular respiration?: a. oxygen b. air c. energy d. lactic acid

mezya [45]

Explanation:

lactic acid because of the acid it will release in the cellular respiration

6 0

3 years ago