04/05/21

4 grams of H2O produces 0.67g of HF. What is the % yield?
CH3COF+ H2O —> CH3COOH + HF 91% 111% 656% 15% 22%
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04/05/21

when 53.2g Na react with 65.8g Cl2, which one is the limiting reactant ?
2Na + Cl2 —> 2NaCl O2 H2O Cl2 NaCl Na
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04/05/21

which molecule has a triple bond?
h2o co2 o2 nh3 hcn
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04/05/21

a sample of oil has a specific heat capacity of 1.75J/g C. How much energy is required to increase the temperature of 2.00kg from 23C to 191C?
8.05 x 10^4 J 6.69 x 10^5 J 5.88 x 10^5 J 7.49 x 10^5 J 1.92 x 10^5 J
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04/05/21

a sample of iron undergoes an increase in temperature of 23.3C when 275J of energy are absorbed. If copper has a specific heat capacity of 0.385J/g C what is it’s mass?
148g 30.8g 4.6g 23.2g 275g
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04/05/21

A system does 591kJ of work and loses 241kJ to the surroundings. What is the change of energy?
-350KJ -241KJ +832KJ -832KJ +350KJ
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04/05/21

Which is an exothermic process?
water evaporating from liquid to vapor water freezing to ice dry ice sublimating from solid to gas water boiled from liquid to steam ice melting from solid to water
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04/05/21

What's a vacuum aspirator and how will it affect the color of a solution?

Originally greenish-yellow because of 1M of HCL added. HCO3-(aq) <-> CO2(g) + OH- (aq)But what happens when using a vacuum aspirator? Isn't its point to remove impurities? So how would the... more
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04/05/21

Solving systems of equations word problems worksheet for all problems, define variables, write the system of equations and solve variables.
The frosty Ice-cream shop sells sundaes for $2 and banana splits for $3. On a hot summer day, the shop sold 8 more sundaes than banana splits and made $156.
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04/05/21

Chemistry Help Please

3Al (s) + 3NH4ClO4 -->Al2O3(s) + AlCl3 (s) + 3NO (g) + 6H2O (l)1)Which reactant is the limiting reactant if 4.25 g of Al is mixed with 5.46 g of NH4ClO4 2)How many grams of Al2O3 can be... more
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04/02/21

chem question help 22-2
How many moles of oxygen gas are required to completely combust 35.3 g of methane gas (CH4). 
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04/01/21

If 96 g of the mixture are prepared, what amount (in grams) of each chemical is needed?
In a chemical mixture, 3 g of chemical A are used for each gram of chemical B, and 4 g of chemical C are needed for each gram of B. If 96 g of the mixture are prepared, what amount (in grams) of... more
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04/01/21

How many moles of KCIO3 are needed to produce 3.6 moles of O2
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04/01/21

I need to write about a cultural myth Can you please help me What topic should i choose These are the steps that i will follow on my essay but im struggling what topic i should pick

Step 1: Choose a cultural myth that interests you. Step 2: Introductory paragraph contains your thesis statement (main idea), describing the cultural myth. Remember, an introductory paragraph... more
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04/01/21

According to this equation, which mole ratio of oxygen to propane is correct?
The balanced equation below represents a reaction between propane and oxygen.        C3H8 + 5 O2 → 3 CO2 + 4 H2OAccording to this equation, which mole ratio of oxygen to propane is correct?
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04/01/21

How many grams of carbon tetrachloride can be produced from reacting 709.0 grams of chlorine (Cl2) with excess methane?
Carbon tetrachloride is a solvent which is used as a refrigerant and also as a cleaning agent. Today, methane and chlorine are mainly used to produce carbon tetrachloride: CH4 + 4Cl2 → CCl4 +... more
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04/01/21

Convert 42.97 grams of carbon monoxide (CO) to liters at STP.
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03/31/21

How many grams of KCI are produced from 1.34 moles of 012? 2 K + Cl2 --> 2 KCI

a. 2.68 g KCI b. 100. g KCIc. 148 g KCI d. 200. g KCI
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03/30/21

What is the value of q
Delta h= -126 n =3mol q?
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03/30/21

how many liters of oxygen. Did you need to burn 67.2 liters of C5H12 complete
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03/30/21

find initial tempeture
A deli sandwich is placed inside a cooler. As the sandwich cools, its temperature C(t) in degrees Celsius after t minutes is given by the following exponential function.C(t)=25(0.89)^tFind the... more
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03/30/21

answer all the questions

help ; You are the chief NASA engineer for the Apollo 13 mission to the moon. The astronauts have oxygen available on board but need to get rid of the expelled carbon dioxide, otherwise they will... more
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03/29/21

If 3.91 moles of H2 were used, how many moles of NH3 would be made? Use the following equation for the problem: N2 + 3H2 —> 2NH3
Help me with this quick! It’s in a test and I need to show my work
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03/29/21

chemistry help 21-2
In the balanced chemical equation below, how many moles of copper(II) carbonate are made from the reaction of 36 grams of copper(II) sulfate and excess silver carbonate? CuSO4 + Ag2CO3 -->... more
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03/29/21

chemistry help 21-2
The following chemical equation has NOT been balanced. zinc nitride + chlorine --> zinc chloride + nitrogen How many moles of chlorine gas are needed to react fully with 14.7 g of zinc... more
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