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Jobisdone [24]
4 years ago
13

A pound is approximately 0.45 kilogram. A person weighs 87 kilograms. What is the person's weight, in pounds, when expressed to

the correct number
of significant figures?
A.
190 lb
B.
180 lb
C.
52 lb
D. 39 lb
Chemistry
2 answers:
andrew11 [14]4 years ago
4 0

Answer: A. 190 lbs.

Explanation: To find the mass in pounds we will use the following conversion factor: 1 lb = 0.45 kg

Solution:

87 kg x 1 lb / 0.45kg = 193 lbs.

Among the choices 190 lbs is the closest so it is the answer.

PIT_PIT [208]4 years ago
3 0
It would be 190 because 87•.45 is 193, and the dig figs makes it 190
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Answer : 58.44 g

<h3>Further explanation</h3>

The reaction

\tt Na+Cl\Rightarrow NaCl

mole ratio :

Na : Cl : NaCl = 1 : 1 : 1

Molar mass of Na : 22,989769 g/mol = 22.99 g/mol

Molar mass of Cl : 35,453 g/mol= 35.45 g/mol

Molar mass of NaCl : 58,44 g/mol

Let's check the mol for reactant (Na and Cl) and product(NaCl)

  • mol of Na :

\tt mol=\dfrac{22.99}{22.99}=1

  • mol of Cl :

\tt mol=\dfrac{35.45}{35.45}=1

Then the reactants are completed reacting because it matches the mole ratio, which is 1: 1

so that the mole of the product can be determined from the mol Na or Cl, which is 1

  • mass of NaCl :

\tt =\dfrac{mol~NaCl}{mol~Na}\times MW~NaCl\\\\=\dfrac{1}{1}\times 58.44\\\\=\boxed{\bold{58.44~g}}

3 0
4 years ago
Is this atom more likely to gain electrons or to lose electrons? Explain how you can tell
elena55 [62]

Answer:

Likely to gain electrons

Explanation:

The atom shown is likely to gain additional electrons to complete its electronic configuration.

  • Since this is a neutral specie, the number of protons and electrons are the same.
  • The atom has 16 electrons
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The atom will prefer to gain additional 2 electrons to give an octet configuration.

5 0
3 years ago
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bixtya [17]

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Explanation:

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OLEGan [10]
The correct answer is C
5 0
4 years ago
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Soloha48 [4]

Answer:

i believe the answer is Aluminum (Al)

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5 0
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