Which type of concentration is calculated when the grams of solute is divided by the grams of the solution, and the result is multiplied by 1 000 000?(1) molarity (2) parts per million(3) percent by mass (4) percent by volume
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The correct answer is option 2. One way of expressing concentration is by expressing it by parts per million or ppm. It is calculated by dividing the grams of solute and the grams of the solution, and the result is multiplied by 1 000 000. Parts per million is equal to 1 milligram of solute per kilogram of solution.
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if i have 7.7 moles of a gas at a pressure of 0.09 ATM and a temperature of 329 K , what is the volume of the container that the gas is in ?
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What is the total number of valence electrons in an atom of germanium in the ground state?(1) 8 (3) 14 (2) 2 (4) 4
Bond the following atoms. Determine if they are ionic or covalent, circle your choice. Show the valence electrons and how they are either shared between the atoms or how they are transferred between atoms. Then write the chemical formula in the space provided.Ionic or covalentC ClFormula ____________ Ionic or covalentMg ClFormula _____________
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Buffer capacity is defined as the capacity of a buffer to resist changes in pH upon addition of an acid or a base. The buffer capacity is high when the concentration of the acid and its conjugate base is high, and the pH of the solution is near the pKa value of the weak acid.
The greater the buffer capacity, the better it can resist pH changes upon addition of an acid or base. The buffer capacity of a solution is highest when the pH is near the pKa value of the weak acid.
A buffer is a solution that has the ability to resist changes in pH upon the addition of an acid or base. The buffer capacity is highest when the pH of the buffer is close to the pKa of the weak acid component in the buffer. Therefore, the buffer capacity is the highest when the pH is equal to the pKa value of the weak acid.
Therefore, the solution with the greatest buffer capacity is the one with the highest concentration of both the weak acid and its conjugate base, which can resist the changes in pH with the addition of an acid or base.
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b. water
c.a tritant
d. an acid
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Final answer:
1 mol of Lead weighs more than 1 mol of Gold because lead has a higher atomic mass (207.2 g/mol) compared to gold's atomic mass (197.0 g/mol). Option D. is correct.
Explanation:
Consider the atomic masses of both gold and lead, as the question involves comparing a mole of each. Importantly, the molar mass of any substance is numerically equivalent to its atomic weight in Atomic Mass Units (amu). The atomic mass of gold is approximately 197.0 amu while lead has an atomic mass of around 207.2 amu.
Therefore, a 1 mol of Lead (207.2 g) would weigh more than 1 mol of Gold (197.0 g).
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Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the amount of nitrogen in the second sample is 23.3g.
What is mass?
Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)
9 g of hydrogen - 42 g of nitrogen
5 g of hydrogen - x g of nitrogen
9x= 42 ×5
x=23.3g
Therefore, the amount of nitrogen in the second sample is 23.3g.
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5 g of hydrogen - x g of nitrogen
The mass of nitrogen in the second sample is 23.33 g.
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Final answer:
In an isotope symbol, the ion charge is generally indicated at the top right corner, so if you have a calcium ion with a +2 charge, the symbol would be Ca²⁺.
Explanation:
In an isotope symbol, the ion charge is generally indicated at the top right corner. The isotope symbol typically includes the atomic number on the lower left, the atomic symbol in the middle, and the mass number on the upper left. If there is an ion charge, it will be indicated on the upper right of the symbol. Suppose you have an ion with a +2 charge, like a calcium ion, it's symbol would be Ca²⁺.
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Skeleton equation →
Balanced equation →
What is a balanced chemical equation?
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
Skeleton equation -A skeletal chemical equation is a representation of a chemical reaction using chemical formulae of reactants and products.
Skeleton equation →
Balanced equation-A balanced chemical equation tells you the amounts of reactants and products needed to satisfy the Law of Conservation of Mass.
Balanced equation →
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balanced equation C6H12O6 + 6O2 -----> 6CO2 + 6 H2O