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ExtremeBDS [4]
3 years ago
15

How many electrons does uranium have​

Chemistry
2 answers:
mestny [16]3 years ago
8 0

Answer:

92

Explanation:

lora16 [44]3 years ago
3 0

Answer:

92

Explanation:

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2Na + Cl₂ --> 2NaCl, if you start with 0.50 mol of sodium and you ultimately produce 0.43 mol in lab, what is your percent yi
sineoko [7]

Answer:

86% is the percent yield of the reaction

Explanation:

Percent yield is defined as 100 times the ratio of actual yield / theoretical yield.

Based on the reaction:

2Na + Cl₂ → 2NaCl

The theoretical yield is 0.50 moles because 0.50 mol of Na are added in the beginning. As 0.43 moles are produced, actual yield is 0.43 mol. And percent yield is:

0.43mol / 0.50mol * 100 =

<h3>86% is the percent yield of the reaction</h3>
4 0
3 years ago
7. Which of the following represents the largest mass?
Tamiku [17]

Answer:

 10kg = 10 x 1000 = 10,000g

Explanation:

To know the quantity with the largest mass, we have to express all the units in grams:

for: 2 x 10mg = 2 x 10 x 10⁻³ = 0.02g

       0.001kg = 0.001 x 1000 = 1g

       1 x 10⁵ng = 1 x 10⁵ x 10⁻⁹ = 0.0001g

       2 x 10²cg = 2 x 10² x 10⁻² = 2g

       10kg = 10 x 1000 = 10,000g

Note:

              10⁻ ¹      deci(d)

              10⁻²       centi(c)

              10⁻³       milli(m)

            10⁻⁹         nano(n)

            10³           kilo(k)

   

5 0
4 years ago
How do atoms and elements differ from each other?
strojnjashka [21]

Answer:

A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons. An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing just one proton and one electron.

Explanation:

8 0
3 years ago
Read 2 more answers
How many moles of gas at 58° C does it take to fill a 1.75 L flask to a pressure of 12.5 kPa? Please help I will give brainliest
marin [14]

Answer:

0.008 moles of gas are present

Explanation:

Given data:

Volume of gas = 1.75 L

Number of moles =  ?

Temperature of gas = 58°C

Pressure of gas = 12.5 KPa

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

58+273 = 331 K

Pressure = 12.5/101 = 0.12 atm

by putting values in formula:

0.12 atm× 1.75 L = n× 0.0821 atm.L/ mol.K   ×331 K

0.21 atm.L = n× 27.17atm.L/ mol

n = 0.21 atm.L /27.17atm.L/ mol

n = 0.008 mol

3 0
3 years ago
Be sure to answer all parts. identify a, b, and c, intermediates in the synthesis of the five-membered ring called an α−methylen
Vanyuwa [196]
The complete reaction along with intermediates is given below, with each step highlighted in different color.

Step 1:
           In this step an acidic proton at alpha position is abstracted from lactone moiety and corresponding enolate is formed, which is resonance stabilized. Both structures are shown. In this case LDA (<span>Lithium diisopropylamide) acts as a base.
</span>
Step 2:
           The enolate formed attacks on Methyl Iodide, as Iodide being greater in size is a good leaving group and alpha methyl moiety is generated.

Step 3:
           This step is acid catalyzed Bromination. Bromine is added at alpha position.

Step 4: 
           This is elimination reaction and is according to <span>Hofmann's Rule. Here less substituted alkene is generated.</span> 

7 0
4 years ago
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