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2 years ago

Calculate the mass defect for the isotope thorium-234

Chemistry

2 answers:

kiruha [24]2 years ago

8 0

Answer:1.85864 amu

Explanation:

Just got this problem

inn [45]2 years ago

6 0

Mass defect is defined as the difference or discrepancy between the mass of the nucleons and the mass of the nucleus. the nucleons involved are the protons and neutrons.
mp = 1.6727 x 10-24 g = 1.007316 amumn = 1.6750 x 10-24 g = 1.008701 amu
mTh 234 = 234 g/mol = 234 amu

Th234 (protons = 90; neutrons = 144)
mass defect = mp*90 + mn *144 - 234
mass defect = 1.911384 amu

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A chemist prepares a solution of barium acetate by measuring out of barium acetate into a volumetric flask and filling the flask

leonid [27]

The given question is incomplete. The complete question is :

A chemist prepares a solution of barium acetate by measuring out 32 g of barium acetate into a 350 ml volumetric flask and filling the flask to the mark with water. Calculate the concentration in of the chemist's barium acetate solution. Round your answer to significant digits.

Answer: The concentration of barium acetate solution is 0.375 mol/L

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

$Molarity=\frac{n\times 1000}{V_s}$

where,

n = moles of solute

$V_s$ = volume of solution in ml

moles of $Ba(CH_3COO)_2$ = $\frac{\text {given mass}}{\text {Molar mass}}=\frac{32g}{255g/mol}=0.125mol$

Now put all the given values in the formula of molality, we get

$Molarity=\frac{0.125\times 1000}{350ml}$

$Molarity=0.357M$

Therefore, the concentration of solution is 0.375 mol/L

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2 years ago

How to balance CH4 + O2=CO2+H2O

sertanlavr [38]

Answer:

LHS-RHS

1 C - 1 C

4 H-2 H

2 O- 3 O

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Balanced equation is

CH4+2O2==CO2 + 2H2O

Explanation:

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3 years ago

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imagine you are a particle of air explain your journey in the atmosphere as you beacome a heated particle if you answer it clear

enyata [817]

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2 years ago

Which best explains the importance of indicator species?

Contact [7]

Answer:

Explanation:

ndicator species (IS) are animals, plants, or microorganism used to monitor changes in our environment. For example, they can tell us about the impact of pollution on an ecosystem, or how well an impaired environment is being managed or restored.

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2 years ago

Someone answer the limited regent...

OleMash [197]

Answer:

20 g Ag

General Formulas and Concepts:

Chemistry - Stoichiometry

Using Dimensional Analysis

Chemistry - Atomic Structure

Reading a Periodic Table

Explanation:

Step 1: Define

[RxN] Cu (s) + AgNO₃ (aq) → CuNO₃ (aq) + Ag (s)

[Given] 10 g Cu

Step 2: Identify Conversions

[RxN] 1 mol Cu = 1 mol Ag

Molar Mass of Cu - 63.55 g/mol

Molar Mass of Ag - 197.87 g/mol

Step 3: Stoichiometry

$10 \ g \ Cu(\frac{1 \ mol \ Cu}{63.55 \ g \ Cu})(\frac{1 \ mol \ Ag}{1 \ mol \ Cu} )(\frac{197.87 \ g \ Ag}{1 \ mol \ Ag} )$ = 16.974 g Ag

Step 4: Check

We are given 1 sig fig. Follow sig fig rules and round.

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2 years ago