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PIT_PIT [208]
4 years ago
14

Which element does not combine with sulfur? A.F B. G C. H D.K E. All can combine?

Chemistry
1 answer:
maw [93]4 years ago
8 0
Answer is either B or all of the above. “G” is not an element on the periodic table. If it’s not a typo, then the answer is B.
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In a calorimeter, a 1.0 g sample of magnesium is burned to form mgo. in doing so, 25.5 kj of energy are released. what is the mo
Artemon [7]

The molar enthalpy of combustion in kj/mol of magnesium is 620 kj/mol, Option D is the correct answer.

<h3>What is enthalpy of Combustion ?</h3>

The energy released when a fuel is oxidized by an oxidizing agent is called enthalpy of Combustion.

It is given that

a 1.0 g sample of magnesium is burned to form MgO. in doing so, 25.5 kj of energy are released.

Molecular weight of Magnesium = 24.35g

24.35 g makes 1 mole of Mg

1g = 1/24.35

For 0.04 moles  25.5 kJ is released

for 1 mole 25.5 *1/.04

= 620 kj/mol

Therefore the molar enthalpy of combustion in kj/mol of magnesium is 620 kj/mol.

To know more about enthalpy of combustion

brainly.com/question/14754029

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3 0
2 years ago
As Nicole walks to her dorm room after a study group in the library she sees a backpack being stolen. The neurotransmitter activ
34kurt

As Nicole walks to her dorm room after a study group in the library she sees a backpack being stolen. The neurotransmitter activated during this emergency situation is a. norepinephrine.

High levels of norepinephrine can also lead to headaches, high blood sugar, and sleep disturbances. Too much norepinephrine also causes anxiety, high blood pressure and heart rate, and organ stress. Drug withdrawal, chronic renal disease, and mental illnesses like PTSD can also result in high norepinephrine levels. Neurons discharge neurotransmitter, which are chemical messengers, into the synapse through synaptic vesicles. Some neurotransmitter work by increasing the neuron's negative electrical charge, which makes it less likely to activate. This is a deterrent effect. Serotonin is an example of this.

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5 0
2 years ago
Which evidence suggests that tulip populations may be affected by a warming climate?
zalisa [80]
B. I say be because she is watering the plants early so nothing happened to her
5 0
3 years ago
Help please! due in an hour.
zalisa [80]

Answer:

can you post another photo i do not see well

4 0
3 years ago
Read 2 more answers
Calculate the mass of O2 needed to combine with 62g of phosphorus according to the balanced equation: 4P + 5O ------&gt; 2P2O5
Alborosie
Answer:
mass of oxygen = 80.077 grams

Explanation:
From the periodic table, we can find that:
atomic mass of oxygen = 16 grams
atomic mass of phosphorus = 30.97 grams

The balanced equation is:
4P + 5O₂ ..............> 2P₂O₅

From this balanced equation we can note that:
4 moles of P are required to react with 5 moles of O₂
This means that:
4 * 30.97 = 123.88 grams
are required to react with
5 * (16*2) = 160 grams

Therefore, to know the mass of oxygen required to react with 62 grams of phosphorus, all we have to do is cross multiplication as follows:
123.88 grams of phosphorus ..................> 160 grams of oxygen
62 grams of phosphorus .........................> ?? grams of oxygen

mass of oxygen = (62*160) / (123.88) = 80.077 grams

Hope this helps :)
7 0
3 years ago
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