06/09/21

chemistry question
 The chemical formula for copper (II) sulfate pentahydrates is CuSO4*5H2O.Please answer the following in number only; example, 4How many copper (Cu) atoms in copper (II) sulfate... more
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06/09/21

What is the answer?
Gasoline (octane) combusts with oxygen gas according to the following reaciton:2𝐶8𝐻18+25𝑂2⟶16𝐶𝑂2+18𝐻2𝑂Calculate the volume, in Liters of CO2 (g)  produced when 648.17 g of C8H18 react at... more
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06/09/21

2 NABr + Ca(OH)2 = CaBr2 + 2 NaOH How many moles of CaB 2 are produced, if 14.72 moles of NaBr and excess Ca(OH) 2 react?
Grateful for any help given!
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06/09/21

Urgent Help, Statistics Question, Linear Correlation

Which is the correct answer and explain why please. The answer for this was D. but I thought it was B. and I don't understand why. And what do they mean by "hidden variable," where does it usually... more
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06/09/21

write your answer as a ratio. *
Spring Village is 80m above sea level while the minor trigonometrical station at Bushy park is 40m. Given that the distance between the two places is 1km 500m. Calculate the gradient. Remember to... more
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06/09/21

original value of painting is $1,800.value increases 12% each year.The owner would like to sell it once it reaches a value of $6000. How long should the owner wait before selling the painting?

A) 10.6 years B) 1.5 years C) 3.3 years D) 6.6 years
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06/09/21

Solve for t help please

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06/09/21

How can i use a function to find dimensions if the volume is already given ?

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06/09/21

A sample of neon gas occupies a volume of 461 mL atSTP. What is the volume of the neon gas when thepressure is reduced to 0.76 atm?
please show work !!!!!!!!!!!!!!!!!!
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06/09/21

PLZ HELP QUICK 🙏!!!!!!
A scientist is investigating the following reaction: 2K + MgBr2 --> 2KBr + Mg If they started with 34 g of K and had an unlimited supply of MgBr2 and produced 6 g of Mg, what is their percent... more
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06/09/21

A rectangular tank with a base area of 600 cm2 and a height of 33 cm is filled with water to a height of 18 cm. How many liters of water are needed to fill the tank completely?
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06/09/21

A 7.25-L container holds a mixture of two gases at 37 °C. The partial pressures of gas A and gas B, respectively, are 0.352 atm and 0.810 atm.

If 0.220 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?it says answer should be P total=___ atmI keep getting 1.93 and it says its wrong
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06/09/21

3 Si + 2 N2 →Si3 N4 How many grams of Si3 N4 can be produced from0.46 moles of N2

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06/08/21

Given the balanced equation of H2SO + O2 → H2SO3, how many liters of O2 are needed to produce 2.5 x 102 g H2SO3 at standard temperature and pressure?
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06/08/21

The balanced equation is C3H8+ 5O2 --------> 3CO2+4H2O, if 8.0 mol C3H8 reacts with 4.0 mol O2. Please show the work for A-E
a. how many moles of CO2 will be produced?b. what is the limiting reactant? the excess reactant?c. how many moles of excess reactant were left unreacted?d. if 5.0 grams of C3H8 reacts with 2.0... more
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06/08/21

Please help me please I need help with my Algebra homework as soon as possible please I am so tired and stressed

Which points on the graph shown are within 5 units of the point (4, −3)?   A.) P, Q, R   B.) N, O, P   C.) R, S, T   D.) L, M, N
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06/08/21

How can i solve this

Given the equation below, how many moles of Carbon dioxide will be produced from 56 moles of oxygen?2CO + O2 -> 2CO2
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06/08/21

How can i solve this equation

Given the equation below, how many liters of hydrogen are needed to react with 60 L of nitrogen3H2 + N2 -> 2NH3
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06/07/21

Percent Yield Problem
  For the balanced equation shown below, if the reaction of 48.3 grams of O2 produces 8.31 grams of H2O, what       is the percent... more
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06/07/21

what is the written answer for this?
What happens when hydrochloric acid (HCl) is added to the solution? Do the relative concentrations of H+, CH3​COOH, or CH3​COO− change?
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06/07/21

Determine the equation of the line that is perpendicular to y=−3x−2, and passes through the point (9,2).

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06/07/21

Stoichiometry Problem
 If 50.0 grams of silicon dioxide is heated with excess of carbon, 27.9 grams of silicon carbide is produced during the... more
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06/07/21

Stoichiometry Problem
In a particular reaction between copper metal and silver nitrate, 12.7 g Cu produces 38.1 g Ag. What is the percent yield of silver in this... more
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06/07/21

chapter 7 gen chem
Hydrazine, N2H4, reacts with oxygen to form nitrogen gas and water.N2H4(aq) + O2(g) ------ N2(g)+2H2O(1)If  2.15g of N2H4 reacts with excess oxygen and produces 0.750L of N2, at 295K and 1.00atm... more
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06/07/21

chapter 7 Gen Chem
A gas cylinder that contains argon has an internal volume of 43.8L A pressure gauge attached to the cylinder reads 1990 psi (1 atm=14.7 psi) at 24.7 Celsius What mass of argon is contained in... more
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