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4 years ago

11

While running a column a student notices that after 43 min, approximately 30 mL of solvent has been eluted. Calculate the flow r

ate of the column.

1 answer:

34kurt4 years ago

6 0

Answer:

F = V / T

= $\frac{30ml}{0.72hr}$

= 42ml/hr

Explanation: first convert time into hours,then deduce the formula for the flow rate

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When iron metal reacts with sulfuric acid, it produces iron (III) sulfate and hydrogen gas. Balance the equation: Fe + H2SO4 → F

uranmaximum [27]

Taking into account the law of conservation of matter, the balanced reaction is:

2 Fe + 3 H₂SO₄ → Fe₂(SO₄)₃ + 3 H₂

First, you must know that the law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.

Then, you must balance the chemical equation. This is, balancing a chemical equation is to equalize the number and class of reactant atoms, ions or molecules with the products, in order to comply with the law of conservation of mass.

For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.

The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.

This is because the subscripts that are placed on chemical symbols or formulas indicate the number of atoms that make up the substance. If the coefficients are modified, the quantities of the substance change, but if the subscripts are modified, different substances are originated.

In this case, the balanced reaction is:

2 Fe + 3 H₂SO₄ → Fe₂(SO₄)₃ + 3 H₂

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3 years ago

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Use the reaction, which produces ammonia, to answer the question.

zepelin [54]

This problem is providing us with the chemical equation depicting the production of ammonia from nitrogen and hydrogen at equilibrium and asks for the correct change when the concentration of nitrogen is increased. At the end, the answer is the forward reaction would increase to start reducing the concentration of N2.

<h3>Chemical equilibrium</h3>

In chemistry, chemical reactions not always reach a 100-% conversion when reactants get in contact in order to carry out the chemical reaction. Thus, there is a point wherein the concentrations remain the same and is called equilibrium.

In such a way, for this problem, we have the following chemical reaction at equilibrium:

$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$

Now, according to the Le Ch.atelier's principle, an increase in the concentration of any species, shifts the equilibrium away from it, which means that if we increase the concentration of nitrogen, a reactant, the forward reaction will be favored.

Thereby, the correct answer is "the forward reaction would increase to start reducing the concentration of N2".

Learn more about chemical equilibrium: brainly.com/question/26453983

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2 years ago

Four ice cubes at exactly 0 ∘c with a total mass of 52.5 g are combined with 160 g of water at 90 ∘c in an insulated container.

horrorfan [7]

Heat gained by ice cubes would be equal to the - heat lost by warm water

The moles of ice is: 50.5 g / 18.0 g/mol = 2.81 mol

Heat required to melt all of the ice is equal to: 2.81 mol X 6.02 kJ/mol = 16.9 kJ = 16890 J

Now, know whether the warm water will still be above 0C when it loses this much heat:
-1690 J = 160 g (4.184 J/gC) (Delta T) Delta T = -25C

In order to solve for the final temperature, going back to include warming of the melted ice to a final temperature:

q(ice/water) = - q(warm water)

moles (Delta Hf) + m c (T2-T1) = - m c (T2-T1)

50.5 g / 18.0 g/mol = 2.81 mol

2.81 mol X 6.02 kJ/mol + 50.5g (4.184 J/gC) (T2-0) = -160g (4.184 J/gC) ( T2-80)

16916 + 211.3T2 = -669.4 T2 + 53555

36639 = 880.7 T2

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3 years ago

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What is the formula of nickel(ll) nitrate hexahydrate? (a) NiNO3 .6H2O (b) Ni2NO3 .6H2O (c) Ni(NO3)2 .6H2O (d) NiNO3 .12H2O e) N

kakasveta [241]

Answer:

Explanation:

The formula of nickeI(II)nitrate hexahydrate is

Ni(NO3)2.6H2O

So option (c) is correct.

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4 years ago

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To use patterns in observations to say what may happen next

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In order to know what may happen next you need use patterns in the observation

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