A sample of helium gas occupies a weather balloon with a volume of 793.4 mL, pressure of 764 Torr and at a temperature of 13 °C. How many moles of helium gas are in the balloon? Express your answer to the correct number of significant figures and include the unit with your answer.

Q: A Honda Accord gets 24 miles per gallon in the city and is estimated to emit 7 tons of CO2 per year.…

A: Given that 7 tons of CO2 emits from Honda Accord per year. 1 ton = 2000 pounds 1 tree absorb 30…

Q: If the RDA for vitamin C is 60. mg per day, and there are 70. mg of vitamin C per 100. g of oranges,…

A: The relation between oz. and g is as follows:1 oz. = 28.3495 gThus,3 oz. = 85.0485 gThe relation…

Q: Dr. Hellman writes an order for 300 mg of a Gl cocktail to be taken every 6 hours by a patient. The…

A: We have to calculate the mL of GI cocktail that has to be given to the patient.

Q: Some athletes have as little as 3.0% body fat. If such a personhas a body mass of 65 kg, how many…

A: Given body mass of a person is ---65kg. Body fat% is ----3.0 Then, how many pounds of fat is present…

Q: I am taking up space botany in all the free time I have. I need 3.20 kiloflowers to make a space…

A: To convert 3.20 kiloflowers into nanoflowers use the following conversion: 1 kiloflowers = 1012…

Q: How many hours would it take for 1.5 L of saline to be administered with this set up?

A: We have to find time in hours required to take 1.5L saline solution  Given drip rate for the saline…

Q: It requires two sticks of butter to make a batch of 20 cookies. How much butter will it take to make…

A: Simple use of unitary method to solve this problem

Q: Some cooks will tell you that they salt the water used to boil pasta because adding table salt…

A: Given : Elevation in boiling point of solution required = 5 oC And volume of water = 2 L = 2000 mL…

Q: Explain how we know human activity contributes to global warming that causes sea level rise. What is…

A: Global warming has different adverse effects. Global warming can become the sole reason for human…

Q: Calculate the cost per individual molecule of your pain reliever. Acetaminophen has the chemical…

A:

Q: ach sketch below shows three objects with an electric charge. In each case, decide whether there is…

A: Electric charge can be positive or negative. In chemistry, electrons carry the negative charge while…

Q: You are on a bus and a fellow passenger collapses clutching their chest and trying to open a pill…

A: One lbs=.454kg One mg= . 001gm One tablet contains =.120gm active ingredient Active ingredients…

Q: Carl is approaching the Canadian border on a trip from Vermont to Montreal, Canada, and the gas in…

A: Given : price of gas in US = $ 2.45 USD per gallon  Price of gas in Canada = $ 1.40 CAD per litre…

Q: (Chemical Connections 1A) The average lethal dose of heroin is 1.52 mg/kg of body weight. Estimate…

A: Given, Lethal dose of heroin = 1.52 mg/kg Weight of man = 200 lb

Q: In an experiment, calcium carbonate reacted with different volumes of hydrochloric acid in water.…

A: Calcium carbonate reacts with hydrochloric acid to form the carbon dioxide gas.

Q: 5. What are the properties of water that make it important for life? The substances that we are…

A: Water has many properties that makes it important part of life like universal solvent, high heat…

Q: 1. A patient is to receive 5 mEq of potassium chloride. The available stock is 15 mL of potassium…

A:

Q: The concentration of acetaminophen solution is 110 mg/mL. How many mmol of acetaminophen per mL is…

A: We will require the molar mass of acetaminophen. We know acetaminophen is basically the paracetamol.…

Q: grams per liter

A:

Q: Food safety guidelines recommends that a beef rib roast should cook for 23.0 minutes per pound based…

A: Given: Time taken to cook 1 pound of beef rib roast=23.0 minutes. The time taken to cook  5.17…

Q: I have 24 grams of water and 48 grams of ethanol. Which one would be a solute.

A: Number of moles of water available = given mass/ molar mass =24 g / 18 g/mole = 1.3 mole Number of…

Q: +2 +1 +1

A: Answer:Opposite charges attracts each-other and same charges repel each-other and magnitude of that…

Q: A ceiling light suddenly goes out moments after it was turned on. Three hypotheses have been…

A: Occam's razor is a rule used in thinking and science. It says if we have two ideas about the same…

Q: The density of mercury is 13.6 g/mL. Comment on how the density of mercury could cause environmental…

A: Here we have to comment how the density of mercury could cause environmental problems-

Q: Suppose you can climb stairs at a rate of 101 steps/min, which typically burns calories at a rate of…

A:

Q: How many kJ are in 27.4 kcal?

A: The objective of this question is to convert the energy from kilocalories (kcal) to kilojoules (kJ).

Q: A 750 mL IV bag contains a 500 mg of an antianginal drug. A 176 lb patient will receive 5 mcg/kg/min…

A: Initial amount of the antianginal drug = 500 mg  Weight of patient = 176 lb

Q: Briefly state what separates science from opinion?

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: bleach container costs $5.98 and it has a volume of 2.4 ml what is the cost per gallon? The density…

A:

Q: many pharmaceuticals are dispenced in elixirs with the medicine disolved in a pleasant tasting…

A: Solution: Density of a substance is defined as the mass of a substance present in the given volume…

Q: Docusate sodium 100 mg tablets are regularly sold for $3.90. The medication is currently discounted…

A:

Q: Dopamine is commercially available in vials containing 400 mg in 20 mL. An order for 350 mg comes to…

A:

Q: My Data: Ensure Nutrition Shake: 0.038 g/mL Class Data: Group 7:Ensure: 0.0233 g/mL Is 0.0233 g/mL…

A: The measured values are not close to the true value and thus this value is not accurate.

Q: A student notices that her father (who is trying to lose weight) is drinking a lot of diet Pepsi…

A: Given that, FDA recommendation of aspartame = 50 mg/ per kg body weight per day. Weight of father =…

Q: Convert the (US) price of gas of $3.56/gallon into (British) E/L. Hints: 1 £ = $1.35; 1 gallon =…

A:

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.