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tatyana61 [14]
3 years ago
14

How many significant figures are in 0.005439

Chemistry
2 answers:
Neko [114]3 years ago
5 0

Answer:

Number of Significant Figures: 4

The Significant Figures are 5 4 3 9

Explanation:

Agata [3.3K]3 years ago
5 0
Answer: There are 4 significant figures.

You don't count the three zeros before the 5439 as significant figures because the number is a decimal.
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Cysteine and methionine contain sulfur.
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If 0.680 kg of copper(I) sulfide reacts with excess oxygen, what mass of copper metal may be produced ? A) 0.680 kg B) 0.136 kg
Katen [24]

Answer:

D. 0.543kg of copper metal is produced from 0.680kg of copper 1 sulphide.

Explanation:

First write the equation for the reaction:

Cu2S + O2 ------> 2Cu + SO2

Determine the mole ratio of the two substances:

I mole of Cu2O forms 2 moles of Copper metal

The number of moles of copper 1 sulphide used is;

n = mass of Cu2S / molar mass of Cu2S

Mass = 0.680kg = 680g

Molar mass = 159.16g/mol

n = 680g / 159.16g/mol

n = 4.272moles

Determine the number of mole of copper:

Number of moles of copper metal produced from 4.272moles of copper 1 sulphide is therefore:

n of copper = 2 * 4.272 Moles

n = 8.544moles.

Determine the mass copper:

The mass of copper metal produced is therefore = number of moles of copper * molar mass of copper

mass = 8.544 moles * 63.55g/mol

mass = 542.97grams

Mass = 0.543kg

5 0
4 years ago
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Draw the line-angle formula for the most stable carbocation with a molecular formula of: You do not have to consider stereochemi
Yuki888 [10]

Answer:

Following are the answer to this question:

Explanation:

The most stable carbocation is: C_9H^{+}_{11}

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Where,

C=9, N=0, X=0, H=12

\ Degree \ of \ the \ unsaturation= \frac{2\times 9+2+0-0-12}{2}

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which means 3 double bonds and 1 ring.

  • The most stable carbocation is given in the attachment file. please find the attachment.

4 0
3 years ago
what are most of the needed formulas to find the molar volume and the molar concentration (Cm) 11th grade chemistry​
stealth61 [152]

Answer:

Explanation:

molar volume=moles*given volume

for molar concentration we use two formulas molarity and molality

molarity=no of moles/volume

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