Explanation:
From the given parameters we can calculate the mass and number of moles in this amount of solution of NaCl
Volume of solution = 1L
Molarity = 0.5M
We know that this is a solution. The molarity indicates that amount of solute was dissolved in a solvent.
To find the number of moles of solution;
Number of moles = molarity x volume
molarity is the the number of moles of solute in a solution.
input the variables;
Number of moles = 0.5 x 1 = 0.5moles
Mass of NaCl:
Mass of NaCl = number of moles x molar mass
molar mass of NaCl = 58.54g/mol
Mass of NaCl = 0.5 x 58.54 = 29.27g
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Answer:
The answer is
<h2>0.307 g/cm³</h2>
Explanation:
The density of a substance can be found by using the formula
From the question
mass of box is 345 g
volume = 1125 cm³
The density of the object is
We have the final answer as
<h3>0.307 g/cm³</h3>
Hope this helps you
Answer:
appears to be moving back toward unmanned exploration in the form of deep-space satellite exploration.
Explanation:
NASA moved from unmanned probing of space in its initial stage of space exploration to manned space exploration and moon landing and now has gone back to unmanned exploration into deeper space. Deep space is not completely known yet, and the exploration take year and are probably very dangerous for manned exploration for now.
Answer:
10.10
Explanation:
Step 1: Write the basic dissociation reaction for pyridine
C₅H₅N(aq) + H₂O(l) ⇌ C₅H₅NH⁺(aq) + OH⁻(aq) Kb = 1.9 × 10⁻⁹
Step 2: Calculate [OH⁻]
For a weak base, we will use the following expression.
[OH⁻] = √(Cb × Kb) = √(9.2 × 1.9 × 10⁻⁹) = 1.3 × 10⁻⁴ M
Step 3: Calculate pOH
We will use the definition of pOH.
pOH = -log [OH⁻] = -log 1.3 × 10⁻⁴ = 3.9
Step 4: Calculate pH
We will use the following expression.
pH = 14 - pOH = 14 - 3.9 = 10.10
