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Reptile [31]
2 years ago
13

In which 0.01 M solution is phenolphthalein pink?

Chemistry
1 answer:
larisa [96]2 years ago
5 0
<span>Phenolphthalein is chemical compount. It becomes colorless when it is immersed in acidic solution and pink when immersed in basic solution.

(1) CH3OH(aq) - Methanol. It is a weak acid but has basic properties too.
(3) CH3COOH(aq) - </span>hydrated acetic acid<span>
(2) Ca(OH)2(aq) - </span>Calcium hydroxide or lime water. Basic solution<span>
(4) HNO3(aq) - </span><span>Nitric acid

Phenolpthalein becomes pink in 0.01M of  </span><span>2) Ca(OH)2(aq) solution.</span>
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Industrial production of nitric acid, which is used in many products including fertilizers and explosives, approaches 10 billion
mylen [45]

Answer: 9.361\times 10^{4} kJ

Explanation:

The balanced chemical equation :

4NH_3(g)+5O_2(g)\rightarrow 4NO(g)+6H_2O(g)  \Delta H^0_{rxn}=-902.0kJ

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{7.056\times 10^3g}{17g/mol}=415.1moles

According to stoichiometry:

4 moles of NH_3 produces = 902.0 kJ of energy

415.1 moles of NH_3 produces =\frac{902.0}{4}\times 415.1=9.361\times 10^{4} kJ of energy

Thus the change in enthalpy is 9.361\times 10^{4} kJ

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2 years ago
Which of these is a difference between a single skin cell and the skin tissue that covers an entire hand?
fgiga [73]

Answer:

c

Explanation:

the cells grow more than the tissue

7 0
2 years ago
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In an ionic bond:
inna [77]
Correct answer is 
<span>D. One atom accepts electrons from another.</span>
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2 years ago
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According to the equation below, how many moles of Ca(OH)2 are required to react with 1.36 mol H3PO4 to produce Ca3(PO4)2? 3Ca(O
allsm [11]

<u>Answer:</u> The amount of calcium hydroxide needed to react is 2.04 moles

<u>Explanation:</u>

We are given:

Moles of phosphoric acid = 1.36 moles

For the given chemical equation:

3Ca(OH)_2+2H_3PO_4\rightarrow Ca_3(PO_4)_2+6H_2O

By Stoichiometry of the reaction:

2 moles of phosphoric acid reacts with 3 moles of calcium hydroxide

So, 1.36 moles of phosphoric acid will react with = \frac{3}{2}\times 1.36=2.04mol of calcium hydroxide

Hence, the amount of calcium hydroxide needed to react is 2.04 moles

3 0
2 years ago
A sample of an unknown compound with a mass of 0.847 g has the following composition: 50.51 % fluorine and 49.49 % iron. When th
sergejj [24]

Answer: 0,4278g of F and 0,4191g of Fe

Explanation: it's possible to calculate the mass of each element by multiplying the percentage (decimal) of the element by the mass of the compound.

For Fluorine (F)

0,847g * 0,5051 = 0,4278g of F

For iron (Fe)

0,847 * 0,4949 = 0,4191g of Fe

This is determined because even when the compound is decomposed, due to conservative law of mass, the decomposition process do not affect the amount of matter, so the mass of the elements remain even if they are separated from the original molecule.

At the end, the sum of the elements masses should be the total mass of the compound.

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