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alukav5142 [94]
3 years ago
14

You are instructed to deliver about 2 mL of water from a buret with a precision of 0.01 mL. Which of the following measured volu

mes is consistent with these instructions. a. 2.03 mL b. 1.87 mL C. 2.0 ml d.1.999 mL
Chemistry
1 answer:
nikitadnepr [17]3 years ago
7 0

Answer:

C. 2.0 mL

Explanation:

This value is due to the fact that the burettes are instruments that allow accurately measure volumes of liquids, in this case it has a precision of ±0.01 mL, which indicates that this is the smallest value that the burette can measure with accuracy, which indicates that 2 mL can be measured accurately without any problem.

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Octane C8H18 is an ingredient in gasoline. How many carbon atoms are in 20 kg of octane? help please
eduard

Answer:

Octane is a hydrocarbon and an alkane with the chemical formula C 8 H 18, and the condensed structural formula CH 3 (CH 2) 6 CH 3.Octane has many structural isomers that differ by the amount and location of branching in the carbon chain. One of these isomers, 2,2,4-trimethylpentane (commonly called iso-octane) is used as one of the standard values in the octane rating scale.

Chemical formula: C₈H₁₈

Molar mass: 114.232 g·mol−1

Melting point: −57.1 to −56.6 °C; −70.9 to −69.8 °F; 216.0 to 216.6 K

Solubility in water: 0.007 mg dm−3 (at 20 °C)

3 0
3 years ago
Read 2 more answers
How many grams of H2O are produced when 35.0 g of NaOH reacts with 17.5 g of CO,?
zhenek [66]

Answer:

2NaOH + CO2 -> Na2CO3 + H2O

1) Find the moles of each substance

\eq n(NaOH)=\frac{35.0}{22.99+16.00+1.008\\}\  =\frac{35.0}{39.998} \ = 0.8750437522 moles\\n(CO_{2} ) = \frac{17.5}{12.01+32.00} = \frac{17.5}{44.01} = 0.3976369007 moles\\

2) Determine the limitting reagent

\\NaOH = \frac{0.8750437522}{2} = 0.4375218761\\\\

∴ Carbon dioxide is limitting as it has a smaller value.

3) multiply the limiting reagent by the mole ratio of unknown over known

n(H2O ) = 0.3976369007 × 1/2

             = 0.1988184504 moles

4) Multiply the number of moles by the molar mass of the substance.

m = 0.1988184504 × (1.008 × 2 + 16.00)

   = 0.1988184504 × 18.016

   = 3.581913202 g

Explanation:

6 0
3 years ago
Which of the following two conditions will favor a spontaneous reaction?
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Answer:

option A

an increase in entropy and a decrease in enthalpy

pls mark brainliest

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Complexes containing metals with d10 electron configurations are typically colorless because ________. Complexes containing meta
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Answer:

there is no d electron that can be promoted via the absorption of visible light

Explanation:

One of the properties of transition elements is the possession of incompletely filled d orbitals. This property accounts for their unique colours.

The colours of transition metal compounds stem from d-d transition of electrons due to the presence of vacant d orbitals of appropriate energy to which electrons could be promoted.

For elements whose atoms have a d10 configuration, such vacant orbitals does not exist hence their compounds are not colored.

Sometimes, the colour of transition metal compounds stem from ligand to metal charge transfer(LMCT) for instance in KMnO4.

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The graph shows the changes in the phase of ice when it is heated.
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100 degree celcius, because it is the melting point of ice ob

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