01/27/21

I need help with what I can do with what I am given
Molecules of X decompose to form Y and Z as given in the equation below. The rate of this reaction was studied at 200°C, and the data that were obtained to determine the order of the reaction were... more
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01/27/21

A weather balloon contains 394 L of hydrogen gas at STP. How many moles of hydrogen are present?
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01/27/21

chemistry question

Calculate the molality of each of the following aqueous solutions:  (a) 2.50 M NaCl solutions (density of the solution=1.08 g/mL)        Answer=2.68 m  (b) 48.2 percent by mass KBr... more
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01/27/21

Liquid A has a vapor pressure of 99.5 torr at 40.0∘C, and liquid B

Liquid A has a vapor pressure of 99.5 torr at 40.0∘C, and liquid B has a vapor pressure of 281 torr at the same temperature. If 7.50 moles of liquid A and 3.00 moles of liquid B are combined to... more
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01/27/21

Oxygen was discovered by Joseph Priestley in 1774 when he heated mercury (II) oxide to decompose it to form its constituent elements.
a. How many moles of mercury (II) oxide, HgO, are needed to produce125 g of oxygen, O2?b. How many moles of mercury are produced?
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01/27/21

When copper metal is added to silver nitrate in solution, silver metal and copper (II) nitrate are produced. What mass of silver is produced from 100. g Cu?
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01/27/21

Calculate that he changed and kilocalories for melting 170 G of ice at zero Celsius
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01/26/21

chemistry question
When 0.672  g of sodium metal is added to an excess of hydrochloric acid,  6990 J of heat are produced. What is the enthalpy of the reaction as written?2Na(s) + 2HCl(aq) ⟶2NaCl(aq) +H2(g)
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01/26/21

chemistry question
Given the reactions, X(s) + 1/2 O2(g) ⟶ XO(s)  Δ𝐻= −710.1 kJXCO3(s) ⟶ XO(s) + CO2 (g) Δ𝐻=+470.3 kJwhat is Δ𝐻 for this reaction?X(s) + 1/2 O2(g) + CO2(g) ⟶ XCO3(s)
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01/26/21

chemistry question

If 200.8 g of carbon dioxide gas is made from the complete combustion of isopropanol (C3H7OH), how many moles of oxygen are used up?
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01/26/21

A 0.510 g sample of steam at 105.4 °C is condensed into a container with 4.62 g of water at 14.2 °C . What is the final temperature of the water mixture if no heat is lost?
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01/26/21

Which property of gases accounts for pressure?
Which property of gases accounts for pressure?
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01/26/21

Oxygen state in question
Oxygen has a boiling point of -183C and a melting point of -219C, when oxygen is at -198C, what state is it in?
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01/26/21

Chemistry class
how many grams of caffeine ( molor mass=194.19g/mol are found in 3.0 times 10^23
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01/26/21

The osmotic pressure of 0.100 M of KI solution of 25° C is 0.465 atom. Determine the experimental van't Hoff factor for KI at this concentration
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01/26/21

Explain why a 5.0 gram sample of water would not have the same number of particles in it as a 5.0 gram sample of salt?
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01/26/21

chemistry 2 question

1. Assume that you have 1, 2, 5, and 10 mL pipets and a 25 mL volumetric flask only. Describe in detail how you would prepare a solution with a concentration near 0.100 M from a 0.650 M stock... more
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01/26/21

Convert 11.5 grams of ethanol, C2H5OH, to molecules of ethanol.\
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01/26/21

Work done by reactions
Consider the following changes. H2O(g) → H2O(s) H2O2(l) → H2O2(g) H2(g) + F2(g) → 2 HF(g) 2 C4H10(g) + 13 O2(g) → 8 CO2(g) + 10 H2O(l) Mg3P2(s) + 6 H2O(l) → 3 Mg(OH)2(s) + 2 PH3(g) (a)At... more
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01/26/21

homework question
When 0.672  g of sodium metal is added to an excess of hydrochloric acid,  6990 J of heat are produced. What is the enthalpy (in kj) of the reaction as written? 2 Na (s) + 2 HCl (aq) ⟶ 2 NaCl (aq)... more
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01/26/21

chemistry homework question
If you combine 270.0mL of water at 25.00 C and 100mL  of water at 95.00 C what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
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01/25/21

Please help with Chemistry Question!
Consider the reaction of hydrogen and oxygen producing water. If 26.1 g of water is produced and 23.0 g of oxygen is used how many grams of hydrogen are needed?
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01/25/21

need chemistry help
If the 2.47 moles calcium chloride reacts with fluorine gas, how many grams of calcium fluoride are made?
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01/25/21

You mix 44 grams of butane (C4H10) with 60 grams of octane (C8H18). Calculate the mole fraction of butane in this solution, to two significant figures.
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01/25/21

chemistry question

If 2.47 moles of calcium chloride reacts with fluorine gas, how many grams of calcium fluoride are made?
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