10/13/20

Reactions - CONFUSED, urgent
A chemist measures the energy change during the following reaction: 2NH3(g) --> N2(g) + 3H2(g) DeltaH: 160.kJUse the information to answer the following questions. Is the reaction endo- or... more
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10/13/20

Reaction, urgent.
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant... more
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10/13/20

Can you please help me with this?
Bob and Alice can finish a job together in three hours. If Bob can do the job by himself in five hours, what percent of the job does Alice do? (A) 20% (B) 30% (C) 40% (D) 50% (E) 60%
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10/13/20

zachary purchased a computer for 1200 on a payment plan. two months after his balance was 1000. three months after his balance was 900
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10/13/20

Henry took a loan from the bank. D represents Henry’s remaining debt (in $) after T months. D= -200T + 9000. What do the slope and D-intercept represent and what is the rate of change?

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10/13/20

Find f(4) if f(x) =

Find f(4) if f(x) = x2+9/x+1
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10/12/20

Answer with working

Weedon Ltd is trying to do some financial planning for the coming year. Weedon Ltd plans to raise $10,000 in new equity this year and wants to pay a dividend to shareholders of $39,000 in total.... more
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10/12/20

Fill out the following ? with the correct answer using excels formula

DATAcost of wool $200,000cost of serparation process $40,000sales value of intermediate products at split-off point:undyed coarse wool $120,000undyed fine wool $150,000undyed... more
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10/12/20

Can someone help me with this?
x/ac - c + x3/a3
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10/12/20

The French club is sponsoring a bake sale. If their goal is to raise at least $140, how many pastries must they sell at $3.50 each in order to meet that goal?
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10/12/20

The Average mass
What is the average mass of a single argon in gram
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10/12/20

Algebra II: Scientific Notion
(0.00057) (77,426x 103)(38,000,000)(0.000473x10-4)how would you solve this and get the answer in scientific notion?
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10/11/20

The hydrogen ion concentrations in cheeses range from 1.00 10-5 M to 1.26 10-7 M. Find the corresponding range of pH readings
The hydrogen ion concentrations in cheeses range from 1.00  10-5 M to 1.26  10-7 M. Find the corresponding range of pH readings
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10/11/20

The concentration of citric acid (H3C6H5O7) in citric fruits ranges from  0.005 M  to 
The concentration of citric acid (H3C6H5O7) in citric fruits ranges from 0.005 M to 0.30 M. Consider a 85.0 mL sample of pure lime juice with a citric acid concentration of 0.176 M. How many moles... more
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10/11/20

How many atoms or ions of each element are in 177.0 g 023 Ba2+ ions

How many atoms or ions of each element are in 177.0 g of the following substances? (a) BaSO4  × 1023 Ba2+ ions  × 1023 SO42− ions (b) Mg3(PO4)2  × 1024 Mg2+ ions  × 1023 PO43− ions (c) O2  × 1024 O... more
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10/11/20

A 52-kg woman has 7.2 times 10^-3 mol of hemoglobin (molar mass = 64456 g/mol) in her blood. How many hemoglobin molecules is this?
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10/11/20

Determine the mass in grams of 1.6 times 10^-3 mol glucose of , C₆H₁₂O₆
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10/11/20

How many grams of O2(g) are needed to completely burn 95.1 g C3H8(g)?
The combustion of propane may be described by the chemical equationHow many grams of  are needed to completely burn 
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10/11/20

What Is the tax owed for a married couple filing jointly with a taxable income of $312,000?
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10/10/20

Use a graphing utility to graph the quadratic function and find the x-intercepts of the graph. Then find the x-intercepts algebraically to verify your answer. y = 4x^2 + 11x − 20
(x,y) (smaller x-value) = (x,y) (larger x-value) =
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10/10/20

Calculate the equilibrium temperature of the water.
A 47.0g sample of brass, which has a specific heat capacity of 0.375·J·g−1°C−1, is dropped into an insulated container containing 300.0g of water at 15.0°C and a constant pressure of 1atm. The... more
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10/10/20

A farmer applies 1605 kg of a fertilizer that contains 10.0% nitrogen to his fields each year. Fifteen percent (15.0%) of the fertilizer washes into a river that runs through the farm.
If the river flows at an average rate of 0.470 cubic feet per second, what is the additional concentration of nitrogen (expressed in milligrams of nitrogen per liter) in the river water due to the... more
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10/10/20

Urgent: How many mols of HCl remained after neutralization by the antacid?
25.00 mL of 1.034 M HCl was reacted with an antacid tablet and the remaining HCl was titrated with 1.068 M NaOH. If the volume of NaOH at the end point of the titration was 18.50 mL, how many mols... more
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10/09/20

HOW MANY GRAMS ALSO MOLES
When solid lead(II) sulfide ore burns in oxygen gas, the products are solid lead(II) oxide and sulfur dioxide gas.How many grams of oxygen are required to react with 22.0 g of lead(II) sulfide?How... more
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10/09/20

Express the mass in grams to three significant figures.
Ascorbic acid, or vitamin C (C6H8O6, molar mass = 176 g/mol), is a naturally occurring organic compound with antioxidant properties. A healthy adult’s daily requirement of vitamin C is 70-90 mg. A... more
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