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PSYCHO15rus [73]
2 years ago
14

An element consists of 1.40% of an isotope

Chemistry
2 answers:
Dmitriy789 [7]2 years ago
6 0

Answer:

I think it's lead (pb). Hope this helps.

ch4aika [34]2 years ago
3 0

Answer:

lead

Explanation:

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A materials scientist has created an alloy containing aluminum, copper, and zinc, and wants to determine the percent composition
liubo4ka [24]

Answer:

0.8749 grams of hydrogen gas was formed from the reaction.

Explanation:

P = Pressure of hydrogen gad= 744 Torr = 0.98 atm

(1 atm = 760 Torr)

V = Volume of hydrogen gas= 11 L

n = number of moles of hydrogen gas= ?

R = Gas constant = 0.0821 L.atm/mol.K

T = Temperature of vapor = 27.0 °C = 300.15 K

Putting values in above equation, we get:

Using an ideal gas equation:

PV=nRT

n=\frac{PV}{RT}=\frac{0.98 atm\times 11 L}{0.0821 L atm/mol K\times 300.15 K}

n = 0.4374 moles

Mass of 0.4374 moles of hydrogen gas:

0.4374 mol × 2 g/mol = 0.8749 g

0.8749 grams of hydrogen gas was formed from the reaction.

7 0
3 years ago
Elements in the periodic are listed according to
sammy [17]

Answer:

the raising atomic number

Explanation:

Elements are listed on the periodic table according to their atomic number.

6 0
3 years ago
Ethanol, 1-octanol, methanol and 3-methyl-1-butanol contain what functional group characteristics of all alchohols
Amiraneli [1.4K]

Answer:

The hydroxyl group  

Explanation:

The molecular formulas of the above alcohols are

CH₃CH₂-OH

CH₃CH₂CH₂CH₂CH₂CH₂CH₂CH₂-OH

CH₃-OH

CH₃CH(CH₃)CH₂CH₂-OH

The functional group that is characteristic of all alcohols is the hydroxyl group (-OH).

6 0
3 years ago
Evaluate each scenario to determine whether it represents a chemical reaction.
vova2212 [387]

Explanation:

A chemical reaction is one in which a chemical change occurs.

During a chemical change;

  • The process is irreversible
  • New kinds of matter produced
  • There is a change in mass

Based on these premise;

 Baking  cake batter is a chemical reaction because you cannot reverse the process

  Shredding a paper is not a chemical reaction because no new kind of matter is produced.

  Twisting of a metal wire is not a chemical reaction

   Yellowing of newspaper in sunlight is a chemical change. The process cannot be reversed

8 0
2 years ago
Read 2 more answers
How many hydrogen atoms are there in 7.30 moles of ethanol
saveliy_v [14]
There are 6 hydrogen atoms in every molecule of ethanol
6 0
3 years ago
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