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13 days ago

A compound has a mass percentage of 53.46% C, 6.98% H, and 39.56% O. What is the empirical formula for this compound

Chemistry

1 answer:

lorasvet [956]13 days ago

5 1

Answer:

The empirical formula is: C₂H₃O

Explanation:

The empirical formula, often referred to as the “minimum formula,” provides the simplest way to represent a chemical compound, illustrating both the present elements and their minimum integer ratios in terms of atoms.

The mass percentage composition indicates the proportion by mass of each element in a compound.

Using 100 g of the compound as a reference, the percentage can be expressed in grams. Thus, presuming 100 g of the compound consists of 53.46 g of C, 6.98 g of H, and 39.56 g of O.

Considering the molecular masses of each component, one can derive the number of relative atoms for each element:

C: $53.46 g *\frac{1 mol}{12.01 g } = 4.45 moles$

H: $6.98 g *\frac{1 mol}{1.01 g } = 6.91 moles$

O: $39.56 g *\frac{1 mol}{16g } = 2.47 moles$

Subsequently, divide each value by the smallest one:

C: $\frac{4.45 moles}{2.47 moles}= 1.80$

H: $\frac{6.91 moles}{2.47 moles}= 2.8$

O: $\frac{2.47 moles}{2.47 moles}=1$

Approximating decimals to the nearest integer gives:

C: 2

H: 3

O: 1

Therefore the empirical formula is: C₂H₃O

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The metallic radius of a lithium atom is 152 pm. What is the volume of a lithium atom in cubic meters?

eduard [944]

Answer:

The calculated volume of a lithium atom is 1.47 X 10⁻²⁹ m³.

Explanation:

Assuming the atom's volume is spherical (though it’s actually more complex), the volume is mathematically represented by:

$V=\frac{4}{3}\pi R^{3}$ ----------------------------------------------------------------------------------------(Eq. 1)

Here, R corresponds to the lithium atom's radius. Since the radius is provided in picometers, we first convert it into meters.

$R=(152pm )(1X10^{-12}\frac{m}{pm})$

$R = 1.52 X 10^{-10}m$

Substituting this value into Eq.1 provides the desired result.

$V=\frac{4}{3}\pi {1.52X10^{-10}}^{3}$

V= 1.47 X 10⁻²⁹ m³

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8 days ago

For the chemical reaction HCN ( aq ) + KOH ( aq ) ⟶ H 2 O ( l ) + KCN ( aq ) HCN(aq)+KOH(aq)⟶H2O(l)+KCN(aq) write the net ionic

lions [985]

Answer:

H+(aq) + OH-(aq) ⟶ H2O(l)

Explanation:

Step 1: The balanced equation can be presented as

HCN(aq) + KOH(aq) ⟶ H2O(l) + KCN(aq)

H+(aq) + CN-(aq) + K+(aq) + OH-(aq) ⟶ H2O(l) + K+(aq) + CN-(aq)

Step 2: The net ionic equation is formed by removing the spectator ions — those that appear on both sides of the equation — leading us to the final representation:

H+(aq) + OH-(aq) ⟶ H2O(l)

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3 days ago

a nurse practitioner orders Medrol to be given 1.5 mg/kg of body weight. if a child weighs 72.6lb and the available stock of Med

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The amount to administer to the child is 2,469 mL.
To convert to kilograms (kg), the child's weight in pounds (lb) is multiplied by 0.45359237: m(child) = 72.6 · 0.045359237 = 32.93 kg.
To find m(Medrol), the child's mass in kilograms is multiplied by 1.5 mg/kg.
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The concentration of Medrol is d(Medrol) = 20.0 mg/mL.
To find the volume of Medrol needed, use V(Medrol) = m(Medrol) ÷ d(Medrol).
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7 days ago

Infrared spectroscopy is a useful tool for scientists who want to investigate the structure of certain molecules. Which of the f

KiRa [971]

Answer: The energies of infrared photons are comparable to those linked with various vibrational states of chemical bonds. Molecules can absorb infrared photons of specific wavelengths, highlighting the types and strengths of different chemical bonds present within the molecules.

Explanation:

Infrared spectroscopy evaluates the vibrational energy states found in molecules. When a molecule absorbs infrared photons, the chemical bonds vibrate at distinct frequencies. Scrutinizing the alterations in vibrational energy within a molecule allows for the identification of different bond types and consequently the molecule’s general structure. The vibrational behaviors of a molecule encompass bending, stretching, and scissoring motions.

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13 days ago

A 6.1-kg solid sphere, made of metal whose density is 2600 kg/m3, is suspended by a cord. When the sphere is immersed in a liqui

castortr0y [923]

Answer:

The calculated density of the liquid is 1470.43 kg/m³.

Explanation:

Given:

Mass of the solid sphere (m) = 6.1 kg

Density of the metal = 2600 kg/m³

To find the volume of the liquid:

$Volume(V)=\frac{Mass(m)}{Density (\rho)}$