01/15/20

Need help with this Chemistry

When a 0.66-g sample of olive oil is burned in a calorimeter, the heat released increases the temperature of 370 g of water from 22.7 °C to 38.8 °C. What is the energy value for the... more
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01/15/20

Which of the following solutions will have a pH = 1.00?
I first did the question and by using the -log to find pH I thought 1 and 2 would be correct, but the answer key says it is only 1. Can someone explain why please? Thanks!Here are the answers you... more
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01/15/20

What is the least amount of 20 percent H2SO4 solution in grams to dissolve 11 grams of FeS?
Please add some details as I'm still learning.
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01/15/20

Is the mass of cylinder A greater than, less than, or equal to the mass of cylinder B?

Two mixed cylinders have exactly the same volume. Cylinder A has a higher fraction of Al than cylinder B. Is the mass of cylinder A greater than, less than, or equal to the mass of cylinder B?... more
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01/15/20

dissolution of NaOH, amount of energy released
When we add 1g of NaOH(s) into 50ml of water. The temperature rises by 4 degree celsius. Calculate the amount of energy relased in this reaction.In this case, I understand that we use Q=mc deltaT... more
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01/15/20

What does this mean?(Chemistry)
What is SPTWO? It one of the vocab my teacher gave our class?
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01/14/20

If 32.9 grams of carbon monoxide and 18.8 grams of oxygen combine to form carbon dioxide, how many grams of carbon dioxide must form?
Under certain conditions, the substances carbon monoxide and oxygen combine to form carbon dioxide.If 32.9 grams of carbon monoxide and 18.8 grams of oxygen combine to form carbon dioxide, how many... more
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01/14/20

Need help! Standard enthalpy change for balanced reactions
Decomposition of hydrogen peroxide is exothermic with (change in enthalpy= 192kj). Im asking for help on how to calculate how much heat energy will be released when 3.5 grams of Hydrogen peroxide... more
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01/14/20

Dosage Calculation Problem for Healthcare Professionals
37) A 45 YO male weighing 65 kg is to receive tobramycin 2.5 mg/kg/dose IV every 12 hours for a severe infection. Each dose will be administered over 60 minutes. a) How many mg will the patient... more
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01/12/20

You react 2.0 g of O2 and collect 1.40 g of N2 gas. What is your percent yield?

N2H4+O2–>N2+2H2Opartial answer: 7X.XX %
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01/12/20

How many grams of nitric acid are needed to produce 30.0 g of water?
4Zn+10HNO3–>4Zn(NO3)2+ NH4NO3+3H2Opartial answer: 3XX. g HNO3
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01/12/20

You use 4.98 g of Na2SO4, how many grams of barium sulfate are produced?
Na2SO4+Ba(NO3)2–> ?partial answer: 8.XX g NaSO4
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01/12/20

You put in 3.5 mol ammonium nitrate, how many moles of water are produced?
2NH4NO3–>2N2+4H2O+O2partial answer: 7.X mol water
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01/12/20

Find the pOH of the following mixture
determine the pOH of the solution that is the produced by mixing 247 mL of 1.27x10-1 M of MgH2 with 4.99 mL of 4.60x10-4 M Ca(OH)2
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01/11/20

A bracelet containing 0.345 mol of metal atoms is 66% gold. How many particles of gold atoms are in the bracelet?

A bracelet containing 0.345 mol of metal atoms is 66% gold. How many particles of gold atoms are in the bracelet?
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01/10/20

How to balance this redox reaction equation?
HNO3 (aq) + KI (aq) ---> KNO3 (aq) + I2 (s) + NO (g) + H20 (l)
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01/10/20

VAN'T HOFF FACTOR
Hi! How can I know if a compound is ionic or not because i have to find the vant hoff factor...for example: why is the vant hoff factor of the glucose 1? I'd like to get a way to determine it. THANKS
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01/10/20

Equlibrum chemistry
PROBLEM SET #2 For the following equilibria, answer the associated questions below each equation: a)           CH4 (g)  +   H2O (g)  +  heat   ↔   CO (g)  +  3... more
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01/10/20

Hydrogencarbonate

Sherbet lemons are sweets which consist of a flavoured sugar shell filled with sherbet. The sherbet contains sodium hydrogencarbonate, NaHCO3 and tartaric acid (2,3- dihydroxybutanedioic... more
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01/10/20

Stoichiometry questions
H3PO4(aq) + MgCO3(aq) —> Mg3(PO4)2(s) + CO2(g) + H2O(l)if 60 grams of hydrogen phosphate react with 60.0 grams of magnesium carbonate, how many grams of carbon dioxide can be found?
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01/10/20

Stoichiometry question

How many grams of potassium chlorate must decompose to form 40.0 grams of oxygen? The other product of the decomposition is potassium chloride. (Write an equation)
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01/10/20

Stoichiometry question
Phosphorus will burn in oxygen to give diphosphorus pentoxide. How many grams of phosphorus can be burned to produce the diphosphorus pentoxide if 100.0 g of oxygen are available to be used?
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01/10/20

4.515 x 10 24 atoms of Purellium Distinkamide is equal to ___ moles?
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01/10/20

You want to create 12g of copper to meld into a piece of jewerly. You know that when copper(II) chloride reacts with aluminum, copper is a product. How much aluminum would you (? finished down)
You want to create 12g of copper to meld into a piece of jewerly. You know that when copper(II) chloride reacts with aluminum, copper is a product. How much aluminum would you need to start your... more
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01/10/20

How many moles of oxygen atoms are present in 4.39 mol diphosphorus pentoxide (P2O5)?
How many moles of oxygen atoms are present in 4.39 mol diphosphorus pentoxide (P2O5)?
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