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Nimfa-mama [501]
3 years ago
15

What is the uncertian digit in 0.054 g

Chemistry
1 answer:
UkoKoshka [18]3 years ago
8 0

Answer:

5.4g

Explanation:

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A 3.8 g sample of sodium hydrogen carbonate is added to a solution of acetic acid weighing 10.8 g. The two substances react, rel
UkoKoshka [18]

Answer:

3.0 g

Explanation:

The <em>total mass </em>at the beginning of the reaction is:

  • 3.8 g + 10.8 g = 14.6 g

Following the law of conservation of mass, this same mass has to be present once the reaction is complete. This means that the mass diference between <em>the contents of the reaction vessel after the reaction and the mass at the beginning of the reaction</em> is the mass of released carbon dioxide:

  • 14.6 g - 11.6 g = 3.0 g
8 0
2 years ago
Bromine atoms usually end up with how many valence electrons?
Nastasia [14]
Bromine atoms usually end up with SEVEN valence electrons.

Bromine belongs to group 17 i.e. halogen group. Its atomic number is 35. The electron configuration of Bromine is 1s² 2s²2p⁶ 3s²3p⁶ 4s²3d¹⁰4p⁵. In the last shell, we see 4s²4p⁵, thus 2+5 = 7 valence electrons are present.
8 0
3 years ago
Chemistry-mole calculations
mezya [45]

Answer:

somebody answer this please>>>!!!

Explanation:

!!!

6 0
2 years ago
Which of the following is the term used to describe a set of elements whose properties tend to be largely predictable based on p
lys-0071 [83]
Group.... because elements in a group have same chemical properties
8 0
3 years ago
Read 2 more answers
2) Find the volume that 2.0 moles of H2 will occupy at STP?
Rom4ik [11]

Answer:

V = 44.85 L

Explanation:

Given data:

Volume of H₂ = ?

Number of moles of H₂ = 2.0 mol

Given temperature = 273.15 K

Given pressure = 1 atm

Solution:

Formula:

PV = nRT

P = Pressure

V = volume

n = number of moles

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

T = temperature in kelvin

By putting values,

1 atm × V = 2.0 mol × 0.0821 atm.L/ mol.K  × 273.15 K

V = 44.85 atm.L / 1 atm

V = 44.85 L

4 0
3 years ago
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