Wednesday
May 4, 2016

# Posts by twynna

Total # Posts: 54

chemistry
How many moles of argon gas are present in 70L of volume with a pressure of 180atm at 21C?
March 10, 2011

chemistry
A sample of helium gas has a volume of 325L at 25C and at 5atm. At what temperature the gas can be compressed at 50atm to a volume of 125L?
March 10, 2011

chemistry
Calculate the number of atoms in each of the following. A)1.50g potassium B)0.470g of oxygen C)0.555g of silver chlorate,AgCIO3 D)7.57 of platinum please help i do not understand this
February 28, 2011

chemistry
February 28, 2011

chemistry
Calculate the percentages of C,H,and O in C22H44O22.
February 20, 2011

chemistry
Concentrated nitric acid is 16M. What volume of nitric acid must be diluted with distilled water to preapre 5L of 0.1M nitric acid?
February 20, 2011

chemistry
What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?
February 20, 2011

chemistry
Concentrated HCI is 12M. What is the molarity of an HCI solution prepared by dilluting 10ml concentrated HCI to a total volume of 250ml?
February 20, 2011

chemistry
Calculate the molar concentrations for each of the following solutions: A)1.5g NaCI in 100 ml solution B)1.5g K2Cr2O7 in 100 ml solution C)5.55g Na2SO4 in 125 ml solution D)20g MgBr2 in 250ml solution
February 20, 2011

chemistry
How would you prepare the following solutions? A)2%NaCL(w/v) B)0.35M glucose C)0.12M CaCI2
February 20, 2011

chemistry
What volume of a 0.34M MgCI2 soultion is required to make 250ml of a 0.10M solution by dillution?
February 20, 2011

chemistry
How many grams of NaOH are there in 2.5L of a 0.343 M solution?
February 20, 2011

chemistry
How many moles of Kbr are there in 35.8ml of a 0.172M solution?
February 20, 2011

chemistry
How many moles of argon gas are present in 70L of volume with a pressure of 180atm at 21c?
February 20, 2011

chemistry
A sample of helium gas has a volume of 325L at 25C and at 5atm. At what temperature the gas can be compressed at 50atm to a volume of 125L?
February 20, 2011

chemistry
Can you show me how to work this out. Or give me an example. Please and Thanks
February 13, 2011

chemistry
Concentrated nitric acid is 16M. What volume of nitric acid must be diluted with distilled water to prepare 5L of 0.1M nitric acid?
February 13, 2011

chemistry
What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?
February 13, 2011

chemistry
A sample of helium gas has a volume of 325L at 25C and at 5atm. At what temperature the gas can be compressed at 50atm to a volume of 125L?
February 13, 2011

chemistry
what volume of a 0.34M MgCI2, solution is required to make 250ml of a 0.10M solution by dilution?
February 13, 2011

chemistry
How many grams of NaOH are there in 2.5L of a 0.343M solution?
February 13, 2011

chemistry
How many moles of KBr are there in 35.8ml of a 0.172M solution?
February 13, 2011

chemistry
Calculate the number of grams in each of the following: A)0.5 moles of F2 B)10.25 moles of H2 C)11.3 moles of BaSO4
February 13, 2011

chemistry
Calculate the number of moles and atoms. A)64 gm of O2 B)58.9 gm of CI C)90.5gm of (HN4)2SO4 D)243gm of Mg2
February 13, 2011

CHEMISTRY
How many grams are there in 2 moles of each of the following? A)Xe2 B)C6H12O6 C)CH3COOMg
February 13, 2011

chemistry
Calculate the empirical formula of each compound from the mass-composition data given below. A)41%N and 59%O B)45%Na,23%P and 32%O
February 13, 2011

chemistry
Calculate the percentages of C,H,and O in C24H44O22.
February 13, 2011

chemistry
Calculate the formula mass of each of the following compounds: A)H2O3 B)AI2I6 C)C10H22 D)C6H8O6 E)K2CR2O7 F)C56H88O2
February 13, 2011

chemistry
How many grams of NaOH are there in 2.5L of a 0.343M solution?
February 9, 2011

chemistry
How many moles of KBr are there in 35.8ml of a 0.172M solution?
February 9, 2011

chemistry
How many moles of KBr are there in 35.8ml of a 0.172M solution?
February 9, 2011

chemistry
what is the % mass/volume (%W/V)of KOH in 60ml of a solution that contains 5gn of KOH?
February 9, 2011

chemistry
How many moles of argon gas are present in 70l of volume with a pressure of 280atm at 21c?
February 9, 2011

chemistry
The volume of a gas is 435ml at 25c and at 740mmHg.What would be its new volume at STP?
February 9, 2011

chemistry
A sample of helium gas has a volume of 325l at 25c and at 5atm. At what temperature the gas can be compressed at 50atm to a volume of 125L?
February 9, 2011

chemistry
Calculate the number of moles and atoms. A)64 gm of O2 B)58.9gm of CI C)90.5gm of (NH4)2SO4 D)243gm of Mg2 Please help i have NO CLUE HOW TO DO THIS THANKS!!!
February 8, 2011

chemistry
How many grams are there in 2 moles of each of the following? A)Xe2 B)C6H12O6 C)CH3COOMg
February 8, 2011

chemistry
What is the name of the following cmpounds? A)CO B)HCI2O
February 8, 2011

chemistry
Do 65 grams of oxygen and 44 grams of carbon contain equal number of atoms? Calculate the number of atoms?
February 8, 2011

chemistry
What is the percentage composition of nitrogen in silver nitrate?
February 8, 2011

chemistry
How many grams are there in 2 moles of sodium?
February 8, 2011

chemistry
February 3, 2011

chemistry
How do you calculate the weight of the following compounds? A)H2O2 B)C6H8O6 C)K2Cr2O7 D)C56H88O2
February 2, 2011

chemistry
February 2, 2011

chemistry
If 12.45gm NaCL is dissolved in 115ml of water, what is the density of NaCL?
February 2, 2011

chemistry
January 31, 2011

chemistry
If 12.45gm NaCL is dissolved in 115ml of water, what is the density of NaCL?
January 31, 2011

chemistry
January 31, 2011

chemistry
If 12.45gm NaCI is dissolved in 115ml of water, what is the density of NaCI?
January 30, 2011

chemistry
On a trip you travel 308km in 3.5h and use 32l of gasoline. A)What is your average speed in kn per hour? B)What is your gas mileage in miles per gallon?
January 28, 2011

chemistry
If a solution contains 255ml of ethanol in a 375 ml solution, what is the % of ethanol in that solution?
January 28, 2011

chemistry
Before 1982 the US Mint cast penny coins from a copper and zinc mixture. If a 1980 penny weighs 3.051g and contains 0.153g zinc, what is the percent of copper in the coins?
January 26, 2011

chemistry
Before 1982 the US Mint cast penny coins from a copper and zinc mixture. If a 1980 penny weighs 3.051g and contains 0.153g zinc, what is the percent of copper in the coins?
January 26, 2011

chemistry
On a trip you travel 308km in 3.5h and use 32L of gasoline. A) What is your average speed in km per hour? B)What is your gas mileage in miles per gallon?
January 26, 2011

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