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2 years ago

Type the correct answer in the box. Express your answer to three significant figures.

Chemistry

2 answers:

VladimirAG [237]2 years ago

7 0

Given:

Mass of calcium nitrate (Ca(NO3)2) = 96.1 g

To determine:

Theoretical yield of calcium phosphate, Ca3(PO4)2

Explanation:

Balanced Chemical reaction-

3Ca(NO3)2 + 2Na3PO4 → 6NaNO3 + Ca3(PO4)2

Based on the reaction stoichiometry:

3 moles of Ca(NO3)2 produces 1 mole of Ca3(PO4)2

Now,

Given mass of Ca(NO3)2 = 96.1 g

Molar mass of Ca(NO3)2 = 164 g/mol

# moles of ca(NO3)2 = 96.1/164 = 0.5859 moles

Therefore, # moles of Ca3(PO4)2 produced = 0.0589 * 1/3 = 0.0196 moles

Molar mass of Ca3(PO4)2 = 310 g/mol

Mass of Ca3(PO4)2 produced = 0.0196 * 310 = 6.076 g

Ans: Theoretical yield of Ca3(PO4)2 = 6.08 g

ipn [44]2 years ago

6 0

Answer: The mass of calcium phosphate the reaction can produce is 59.95 g.

Explanation:

$3Ca(NO_3)_2+2Na_3PO_4\rightarrow 6NaNO_3+Ca_3(PO_4)_2$

Moles of $Ca(NO_3)_2=\frac{\text{given Mass of }Ca(NO_3)_2}{\text{Molar Mass of }Ca(NO_3)_2}=\frac{96.1 g}{164.08 g/mol}=0.58 mol$

According to reaction:

3 mole of $Ca(NO_3)_2$ gives 1 mole of $Ca_3(PO_4)_2$

Then 0.58 moles of $Ca(NO_3)_2$ will give = $\frac{1}{3}\times 0.58$ moles of $Ca_3(PO_4)_2$ that is 0.1933 moles

Mass of $Ca_3(PO_4)_2$ : number of Moles × Molar mass

$=0.1933\times 310.18 g/mol=59.95 g$

The mass of calcium phosphate the reaction can produce is 59.95 g.

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1 year ago

Lithium has an atomic mass of 6.941 amu. Lithium has two common isotopes. The one isotope has a mass of 6.015 amu and a relative

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Answer:

The atomic mass of second isotope is 7.016

Explanation:

Given data:

Average Atomic mass of lithium = 6.941 amu

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Abundance of second isotope = ?

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Total abundance = 100%

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2 years ago

Rank the formation of the solutions A, B, and C from the most exothermic to the most endothermic. Rank the enthalpy of solution

Elodia [21]

This is an incomplete question, the table is attached below.

Answer : The correct ranking of the solution from most exothermic to most endothermic will be: A, B and C.

Explanation :

As we know that the intermolecular force of attraction play an important role in the interaction of solute-solute, solute-solvent and solvent solvent solution.

In the solution A, the solute-solute and solvent-solvent interactions are weak. So, their solute-solvent interaction will be strong. That means, the solution will be more exothermic.

In the solution C, the solute-solute and solvent-solvent interactions are strong. So, their solute-solvent interaction will be weak. That means, the solution will be more endothermic.

Thus, the correct ranking of the solution from most exothermic to most endothermic will be: A, B and C.

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Suppose you need 7.0 m of Grade 70 tow chain, which has a diameter of 38" and weighs , 2.16/kgm to tow a car. How would you calc

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percent yield = 0.195 g / 0.2224 g x 100 % = 87.7 %

answer is 87.7 %

8 1

2 years ago

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