Answers
Answer: 432 grams
Explanation:NaBr must he measure out to have 4.20 moles.
Related Questions
Identify the true statements about introns.a- they code for polypeptide proteinsb- they have a branch site located 20 to 50 nucleotides upstream of the 3' splice sitec- they end with the nucleotides AG at the 3' endd- they begin with the nucleotides GU at the 5' ende- they tend to be common in bacterial genes
Draw the Lewis structure for the polyatomic hydronium H3O cation. Be sure to include all resonance structures that
Question 51 pts A breathalyzer is a device used to estimate the blood alcohol content of a suspected drunk driver by measuring the amount of alcohol in one's breath. The fuel cell breathalyzer employs the reaction below: CH3CH2OH(g)+O2(g)→HC2H3O2(g)+H2O(g) When a suspected drunk driver blows his or her breath through the fuel-cell breathalyzer, the device measures the current produced by the reaction and calculates the percent alcohol in the breath. How many moles of electrons are transferred per mole of ethanol, CH3CH2OH, in the reaction?
A 5.000 gram sample of lenthionine contains 0.6357 g carbon and 0.1070 g hydrogen, and the remainder is sulfur. The molar mass of lenthionine is 188.4 g/mol. Determine the chemical formula for lenthionine.
Answers
Answer :
Sugar : Compound
Air : Homogeneous mixture
Hot tea : Homogeneous mixture
Salt water : Homogeneous mixture
Explanation :
Element : It is a pure substance which is composed of atoms of similar elements.
Compound : It is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.
Heterogeneous mixtures : It is a mixture that has non-uniform composition throughout the solution and the particle size or shapes are also different.
There is a physical boundary between the dispersed phase and dispersion medium.
Homogeneous mixtures : It is a mixture that has uniform composition throughout the solution and the particle size or shapes are not different.
There is no physical boundary between the dispersed phase and dispersion medium.
As per question,
Sugar : It is a compound that is made from atoms of different elements combined together in a fixed ratio by mass.
Air : It is a homogeneous mixture of the gaseous substances of nitrogen, oxygen, and smaller amounts of other substances.
Hot tea : It is a homogeneous mixture because its composition is the same throughout the solution.
Salt water : It is a homogeneous mixture because its composition is the same throughout the solution.
Sugar compound
Air Homogeneous mixture
Hot tea Homogeneous mixture
Salt water Homogeneous mixture
Element:
An element is a simplest type of a pure substance which is composed of only one type of matter. For examples; silver, gold platinum etc.
Pure substance:
A compound is a pure substance which is composed of two or more type of matter in definite proportion. For examples; water which is composed by Hydrogen and oxygen etc.
Mixture:
A mixture is made from two or more type of matter in any proportion. Mixture are generally two types:
1. Homogeneous mixture
This is also known as solution, in which the composition of the substances is uniform.
Lemon-flavored water is an example of homogeneous mixture because in this the composition of the substances is uniform.
2. Heterogeneous mixture
In this form of mixture the composition of substance are not uniform and the component of mixture also visible.
Stuffed mushrooms is an example of Heterogeneous mixture because in this form of mixture the composition of substance are not uniform and the component of mixture also visible.
Answers
Explanation:
The reaction expression is given as:
2H₂ + O₂ → 2H₂O
The limiting reactant is the reactant in short short supply in the given reaction.
To find the limiting reactant we use the number of moles.
Mass of H₂ = 5g
Mass of O₂ = 10g
Number of moles =
Molar mass of H₂ = 2(1) = 2g/mol
Molar mass of O₂ = 2(16) = 32g/mol
Number of moles H₂ = = 0.4mole
Number of moles O₂ = = 0.3mole
From the balanced reaction equation:
2 mole of H₂ reacts with 1 mole of O₂
0.4 mole of H₂ reacts with 0.2 mole of O₂
But we are given 0.3 moles of O₂, so the limiting reactant is H₂ because oxygen gas is in excess
Final answer:
To find the limiting reactant between hydrogen (H₂) and oxygen (O₂) for water (H₂O) formation, convert given masses to moles, compare with the stoichiometry of the balanced equation, and identify that oxygen (O₂) is the limiting reactant as it has fewer moles available than required.
Explanation:
Finding the Limiting Reactant
To determine the limiting reactant in a chemical reaction between hydrogen (H₂) and oxygen (O₂) to form water (H₂O), we must first balance the chemical equation. The balanced reaction is:
2H₂(g) + O₂(g) → 2H₂O(l)Next, we will calculate the molar masses and use them to find the moles of each reactant:
- Molar mass of H₂ = 2.02 g/mol
- Molar mass of O₂ = 32.00 g/mol
Now, we convert the given masses to moles:
- Moles of H₂ = 5.00 g H₂ × (1 mol H₂ / 2.02 g) = 2.48 mol H₂
- Moles of O₂ = 10.00 g O₂ × (1 mol O₂ / 32.00 g) = 0.313 mol O₂
According to the stoichiometry of the balanced equation, we need 2 moles of H₂ for every 1 mole of O₂ to react completely. Therefore, the moles needed for the given moles of O₂ are:
Moles of H₂ needed = 0.313 mol O₂ × (2 mol H₂ / 1 mol O₂) = 0.626 mol H₂
Since we have 2.48 mol H₂ and only need 0.626 mol to react with all the available O₂, we can see that we have excess H₂ and not enough O₂. Hence, O₂ is the limiting reactant.
Learn more about Limiting Reactant here:
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Answers
Answer:
when gas condenses to liquid the quantity of energy converts.
Explanation:
two phase changes where the heat in energy is released
Now write an equation below that shows how to calculate Kp from Kc for this reaction at an absolute temperature T. You can assume T is comfortably above room temperature. If you include any common physical constants in your equation be sure you use their standard symbols, found in the ALEKS Calculator.
Answers
Answer:
Kp = [CH₄(g)]/[H₂(g)]²(RT)⁻¹
Explanation:
C(s) + 2H₂(g) => CH₄(g)
Kp = Kc(RT)ⁿ
n= change in molar volumes of gas = 1 - 2 = -1
R = 0.08206 L·Atm/mol·K (gas constant)
T = Kelvin Temperature (arbitrary in problem) K =°C + 273
Kc = [CH₄(g)]/[H₂(g)]² (measured values need to be in moles/L)
Kp = [CH₄(g)]/[H₂(g)]²(RT)⁻¹
Answers
The mole fraction of HNO3 is 0.225
Explanation:
1.Given data
Density = 1.429 /ml
Mass% = 63.01 g HNO3 / 100g of solution
The mass of 63.01 g is in 100 / 1.142 /ml of solution
Or 63.01 g in 55.7 mL
Molarity = 15.39 moles / L
Mass of water in 100g = 100 - 63.01=36.99 g
So 63.01 grams in 36.99 grams of water
So mass of HNO3 in 1000grams of water = 63.01* x 1000 / 36.99 = 1703
Moles of HNO3 in 1000g = 1703 / 63.01 = 27.03 moles
Molality = 27.03 molal (mole / Kg)
Mole fraction = Mole of HN03 / Moles of water + mole of HNO3
Mole of water = 62/ 18 = 3.44
Moles of HNO3 = 63.01 / 63.01 = 1.000
Mole fraction = 1.000 / 3.44 + 1.000 = 0.225
The mole fraction of HNO3 is 0.225
increase in the temperature
slowing the rate of enzyme reaction
maintaining the pH
Answers
The prevention of fruits browning is the result of :
>slowing the rate of enzyme reaction
How is the browning of fruits prevented?
The browning of fruits can be slowed down by preventing the enzyme from working properly. Lemon juice contains an acid which can stop enzymes from working properly. For example, water and sugar in jam prevents oxygen in the air to reach enzymes and hence protects from browning.
Always keep cut fruits such as apples, pears and peaches from turning brown by coating them with an acidic juice such as lemon or orange.
The enzyme that is responsible for the browning is called polyphenol oxidase. PPO enzyme in the presence of oxygen changes substances known as phenolic compounds, through oxidation, into quinones.
To know more about enzymes, refer
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Answer:
slowing the rate of enzyme action
Explanation: