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IgorLugansk [536]
3 years ago
11

In a first order reaction 40% of reactant gets converted into product in 30 minutes. What time would it require to convert 75% i

nto product? ​
Chemistry
1 answer:
e-lub [12.9K]3 years ago
5 0
56 minutes and 15 seconds I believe
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Calculate the density of a block of metal with a volume of 12.5 cm cubed and mass of 126.0 g
SVEN [57.7K]
Density is defined as mass/volume (or m/v).

So,

(126.0 g)/(12.5 cm^3)= 10.08 g/cm^3

If your teacher requires correct significant figures, the answer is 10.1 g/cm^3.
If not, the first answer is fine.
3 0
3 years ago
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Hydrazine (N2H4) is used as rocket fuel. It reacts with oxygen to form nitrogen and water.
Marina86 [1]

Answer:

See explanation below for answers

Explanation:

This is a stochiometry reaction. LEt's write the overall reaction again:

N₂H₄ + O₂ ---------> N₂ + 2H₂O

This reaction is taking place at Standard temperature and pressure conditions (STP) which are P = 1 atm and T = 273 K.  To know the volume of N₂ formed, we need to know first how many moles are formed, and this can be calculated with the reagents and the limiting reagent. Let's calculate the moles first of the reagents:

MM N₂H₄ = 32 g/mol;    MM O₂ = 32 g/mol

mol N₂H₄ = 2000 / 32 = 62.5 moles

mol O₂ ? 2100 / 32 = 65.63 moles

Now that we have the moles, we need to apply the stochiometry and calculate the limiting reagent. According to the overall reaction we have a mole ratio of 1:1 between N₂H₄ and O₂, therefore:

1 mole N₂H₄ ---------> 1 mole O₂

62.5 moles ----------> X

X = 62.5 moles of O₂

But we have 65.63 moles, therefore, the limiting reactant is the N₂H₄.

We also have a 1:1 mole ratio with the N₂, so:

moles N₂H₄ = moles N₂ = 62.5 moles

Now that we have the moles, we can calculate the volume with the ideal gas equation:

PV = nRT

V = nRT / P

R: gas constant (0.082 L atm / K mol)

Replacing we have:

v = 62.5 * 0.082 * 273 / 1

V = 1399.13 L of N₂

Now, how many grams of the excess remains?, we know how many moles are reacting so, let's see how much is left:

moles remaining = 65.63 - 62.5 = 3.12 moles

then the mass of oxygen:

m = 3.12 * 32 = 100.16 g of O₂

7 0
3 years ago
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What are the hydrogen bonding atoms in melatonin?
nydimaria [60]

The hydrogen bonding atoms in melatonin are phospholipids and cholesterol.

<h3>What is Hydrogen bonding?</h3>

This is the type of interaction which involves a hydrogen atom being covalently bound to a more electronegative "donor".

Melatonin controls sleep-wake cycle and has phospholipids and cholesterol which have high affinity for hydrogen bonding.

Read more about Hydrogen bonding here brainly.com/question/12798212

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6 0
2 years ago
Which phrase best describes the main reason scientist perform experiments
4vir4ik [10]

Explanation:

Scientist performs experiments as a process in the scientific method.

Experiments are quantitative and deliberate efforts towards testing an idea.

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Experiments brainly.com/question/1621519

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6 0
3 years ago
N which changes of state do atoms lose energy? Check all that apply.
Alex73 [517]
When liquid state is being converted to solid state, atoms come closer to each other and their speed of movement also decreases. Instead of moving about in the substance, they are only able to vibrate about their positions in solid. Hence, this change leads to loss of energy. Similarly, atoms loose energy when state changes from gas to liquid. 
3 0
3 years ago
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