The mass percentage of the solution that we have in the question is 5 g.
What is percent w/w concentration?Percent w/w (weight/weight) concentration is a way to express the concentration of a solute in a solution as a percentage by mass. It represents the mass of the solute in grams per 100 grams of the solution.
Percent w/w concentration is commonly used in industries such as pharmaceuticals, food and beverage, and cosmetics to measure the concentration of active ingredients or additives in their products.
We know that;
%w/w = weight of the solute/Weight of the solution
Let the weight of the solute be x
1 = x/500 * 100/1
1 = 100x/500
500 = 100x
x = 5 g
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how many electrons are in the outermost shell of oxygen
Answer:
6
Explanation:
electronic configuration is 2,6.
From electronic configuration we can see that oxygen have 6 electrons in its outermost shell.
How many moles of sodium (Na) are there in a
sample of 5.87 x 1024 atoms of sodium?
There are 9.8 moles of sodium (Na) in a sample of 5.87 x 10²⁴ atoms of sodium.
HOW TO CALCULATE NUMBER OF MOLES?The number of moles of a substance can be calculated by dividing the number of molecules in the substance by Avogadro's number. That is;
no. of moles = no. of atoms ÷ 6.02 × 10²³
According to this question, there are 5.87 x 10²⁴ atoms of sodium. The number of moles is as follows:
no. of moles = 5.87 x 10²⁴ atoms ÷ 6.02 × 10²³
no. of moles = 0.98 × 10¹
no. of moles = 9.8moles
Therefore, there are 9.8 moles of sodium (Na) in a sample of 5.87 x 10²⁴ atoms of sodium.
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do all species take care of their offspring in the same way?
Answer:
No
Explanation:
not every species take care of their offspring/babies some abandon their babies and leave and some take care of them till they are older
In a chemical reaction, what are the numbers in front of an element called?
Answer:
oxidation numbers
Explanation:
chemical equation tells the story of a chemical reaction. Reactants are the starting substances in the reaction while products are the new substances that are formed. The large numbers in front of some of the formulae are called coefficients. These coefficients are used to balance the equation. Chemical reactions must obey the Law of Conservation of Matter. The number of atoms of each element on both sides of the equation must be equal because matter cannot be created or destroyed
17. Calculate the mass of hydrogen formed when 24 g of aluminum reacts with excess hydrochloric acid
according to the balanced equation below.***
2A1 + 6HCI - 2 AlCl3 + 3 H2
a. 1.5 g
b.2.7 g
c. 3.4g
d. 6.6 g
Answer:
c) 2.7 g
Explanation:
The first step is to find the moles of aluminum that you're reacting. To do this, you would do
24 g × molar mass of aluminum = 24 g ÷ 26.982 g/mol = 0.8895 mol Al
Then by the balanced equation, you know that every 2 moles of Al will produce 3 moles of H2. This implies that 0.8895 × (3/2) = 1.334 moles of H2 will be produced
Lastly to find the mass of H2 produced, multiply the moles of H2 produced by the molar mass of H2
1.334 mol × (2 × 1.008 g/mol) = 2.69 g ≈ 2.7 g
1)
If I have 9 moles of a gas at a pressure of 1 atm and a volume of 12 liters, what is
the temperature?
ideal gas
PV=nRT
T = PV/nR
T = 1 x 12/9 x 0.08205
T = 16.25 K
What is the difference between physics and chemistry laboratory (4)
Answer:A fundamental difference is that physics is more focused to finding the universal laws of general processes, whereas chemistry focuses more on details and specific phenomena, such as what is the boiling point of this substance and why.
Explanation: hope it help
2. Circle all of the following that change with the temperature of a reaction.
3. Draw an arrow on this graph of the Arrhenius equation that shows where you would find ln A (log of the frequency factor).
4. If the slope of the line in the graph above is -350 K, what is the value of Ea (in J/mol)?
Based on the effect of temperature on a reaction, a change in temperature affects the rate constant K.
Based on the Arrhenius equation, the y-intercept gives the value of ln A.
From the value of the slope, the value of Ea is 42.1 J/mol.
What is the effect of temperature on a reaction?A change in the temperature of a reaction acts to increase the rate of reaction.
Change in temperature has no effect on the ideal gas constant.Change in temperature has no effect on the activation energy.Change in temperature has no effect on the concentration of reactants.Change is temperature can either lower or increase the rate constant of a reaction.Change in temperature has no effect on the order of reaction.According to the Arrhenius equation, the y-intercept gives the value of ln A.
From the graph; slope = -Ea/R
Ea = -slope/R
Where;
Ea is activation energy R is molar gas constant = 8.314 J/K.molSlope = -350 KEa = -(-350)/8.314
Ea = 42.1 J/mol
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A 5.0 L vessel has a total pressure of 5.0 atm. The partial pressure of the gases in the
vessel are 1.2 atm N2, 2.0 atm F2, and 1.0 atm H2 at 273 K.
What is the partial pressure of the remaining gas that was not measured?
10.5 atm
0.5 atm
2.0 atm
0.8 atm
The partial pressure of the remaining gas that was not measured is 0.8 atm.
Partial pressure of gasesThis is the individual pressure exacted by each gas in the containing vessel. This partial pressure of individual gases make up the total pressure.
Pt = P₁ + P₂ + P₃ + P₄
5 = 1.2 + 2 + 1 + P₄
5 = 4.2 + P₄
P₄ = 5 - 4.2
P₄ = 0.8 atm
Thus, the partial pressure of the remaining gas that was not measured is 0.8 atm.
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True or False Photosynthesis and Cell Respiration are opposite reactions. Photosynthesis provides the molecules needed for cell
respiration, and cell respiration provides the molecules need for photosynthesis.
O False
True
Answer:
The answer is True.
