# 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?

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?

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

chemistry

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

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?

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

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?

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

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

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

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

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

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

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?

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

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?

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

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?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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?

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!!!

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

chemistry
What is the name of the following compounds? A)CO B)HCI2O

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

chemistry
What is the percentage composition of nitrogen in silver nitrate?

chemistry
How many grams are there in 2 moles of sodium?

chemistry

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

chemistry

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

chemistry

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

chemistry

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

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?

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

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?

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?

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?

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