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ladessa [460]
3 years ago
11

How many moles of bromine atoms are in 2.60×10^2 grams of bromine?

Chemistry
1 answer:
AlladinOne [14]3 years ago
4 0
Your answer is 3.25 moles of Bromine

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URGENT ! PLEASE ANSWER QUICKLY
Bumek [7]

Answer:If we dissolve NaF in water, we get the following equilibrium:

text{F}^-(aq)+text{H}_2text{O}(l) rightleftarrows text{HF}(aq)+text{OH}^-(aq)

The pH of the resulting solution can be determined if the  K_b of the fluoride ion is known.

20.0 g of sodium fluoride is dissolve in enough water to make 500.0 mL of solution. Calculate the pH of the solution. The  K_b of the fluoride ion is 1.4 × 10 −11 .

Step 1: List the known values and plan the problem.

Known

mass NaF = 20.0 g

molar mass NaF = 41.99 g/mol

volume solution = 0.500 L

K_b of F – = 1.4 × 10 −11

Unknown

pH of solution = ?

The molarity of the F − solution can be calculated from the mass, molar mass, and solution volume. Since NaF completely dissociates, the molarity of the NaF is equal to the molarity of the F − ion. An ICE Table (below) can be used to calculate the concentration of OH − produced and then the pH of the solution.

Explanation:

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What are the correct two steps, in the correct order, that would allow you to solve for x in the following equation?
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4th one is correct...............

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What is the best definition of the enthalpy change Hr
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<em>The flow of thermal energy in a system, at constant atmospheric pressure AND at thermodynamic standard temperature and pressure.</em>

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Find the equation of the line passing through the points (2, 1) and (5, 10).​
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The equation : y=3x-5

<h3>Further explanation </h3>

Straight-line equations are mathematical equations that are described in the plane of cartesian coordinates

General formula

y-y1 = m(x-x1)

or

y = mx + c

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m = straight-line gradient which is the slope of the line

x1, y1 = the Cartesian coordinate that is crossed by the line

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m = Δy / Δx

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\tt \dfrac{10-1}{5-2}=3

  • Equation

\tt y-1=3(x-2)\\\\y-1=3x-6\\\\y=3x-5

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