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2 years ago

20,000 $ give a way but answer this first

Chemistry

2 answers:

horsena [70]2 years ago

5 0

Answer:juhygjdkeExplanation:

Mendelevium is named for Dmitri Mendeleev who produced one of the first periodic tables.

Abelson first found neptunium in 1940 after uranium had been bombarded by neutrons from the cyclotron at Berkeley, California. ... The element was named after the planet Neptune, which is the first planet beyond Uranus.

valentina_108 [34]2 years ago

4 0

Answer in explanation

Explanation:

neptunium was named after the discovery of the planet neptune in september 23 1846

mendelevium was named as dimitri mendeleev

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How many molecules are contained 9.6 mol C2H4?

maks197457 [2]

Answer:

N = 5.8 × 10²⁴ molecules

Explanation:

Step 1: Given and required data

Moles of C₂H₄ (n): 9.6 mol

Avogadro's number (NA): 6.02 × 10²³ molecules/mol

Step 2: Calculate the number of molecules (N) in 9.6 moles of C₂H₄

To convert moles to molecules we need Avogadro's number: there are 6.02 × 10²³ molecules of C₂H₄ per mole of C₂H₄

N = n × NA

N = 9.6 mol × 6.02 × 10²³ molecules/mol

N = 5.8 × 10²⁴ molecules

4 0

2 years ago

A certain compound of bromine and fluorine is used to make UF6, which is an important chemical in the processing and reprocessin

Aleksandr [31]

Answer: The empirical formula is $BrF_3$

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of Br= 58.37 g

Mass of F = (100-58.37) = 41.63 g

Step 1 : convert given masses into moles.

Moles of Br= $\frac{\text{ given mass of Br}}{\text{ molar mass of Br}}= \frac{58.37g}{80g/mole}=0.73moles$

Moles of F = $\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{41.63g}{19g/mole}=2.2moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Br = $\frac{0.73}{0.73}=1$

For F = $\frac{2.2}{0.7}=3$

The ratio of Br: F= 1 : 3

Hence the empirical formula is $BrF_3$

8 0

2 years ago

Given the standard enthalpies of formation for the following substances, determine

Novosadov [1.4K]

Answer:

Explanation:

5 0

2 years ago

If you don't reply with an actual answer I will report it and you will be reported and itll give me back my points

lapo4ka [179]

I think its number 5

6 0

3 years ago

If a solution has virtually no hydrogen ions what kind of pH does it have

marin [14]

I'm not sure it depends if it has any hydroxide ions which in that case it would be alkaline, but if that's the question I'd say tthat the substance is neutral

3 0

2 years ago

Read 2 more answers