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sergiy2304 [10]
2 years ago
11

Which of the following measurements has FOUR significant figures?

Chemistry
1 answer:
garik1379 [7]2 years ago
7 0

Answer:

A) 0.1005 m

sorry if it's wrong

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How do chemists model the valence electrons in a metal
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Answer:

the valence electrons of atoms in a pure metal can be modeled as a sea of electrons

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A device that does work in a circuit is called what ?
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These are called resistors. 
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Why do scientists think there is an undiscovered carbon sink somewhere?
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The major carbon sources (reservoirs that release more carbon than absorbed) are: deforestation and fossil fuels

The major carbon sinks (reservoirs that absorb more carbon than released) are:
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Determine how many gmol, kmol, and lbmols there are in 50 kilograms of n-hexane.
Artist 52 [7]

Answer: 581 gmol

0.581 kmol

1.28\times 10^{-3}lbmol

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{50\times 1000g}{86g/mol}=581mol

1. The conversion for mol to gmol

1 mol = 1 gmol

581 mol= \frac{1}{1}\times 581=581gmol

2. The conversion for mol to kmol

1 mol = 0.001 kmol

581 mol= \frac{0.001}{1}\times 581=0.581kmol

3. The conversion for mol to lbmol

1 mol = 2.2\times 10^{-3}lbmol

581 mol= \frac{2.2\times 10^{-3}}{1}\times 581=1.28\times 10^{-3}lbmol

3 0
3 years ago
Write a balanced chemical equation for the photosynthesis reaction in which gaseous carbon dioxide and liquid water react in the
sasho [114]
6 CO₂ + 6 H₂O (chlorophyll + sunlight) ⇒ C₆H₁₂O₆ + 6 O₂ 
the reaction takes place in presence of sunlight and chlorophyll .. 
CO₂ is oxidized and forms Glucose . And oxygen is evolved in this process. 

3 0
3 years ago
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