A 3.75-gram sample of limestone, CaCO3, contains 1.50 g of calcium and 0.450 g of carbon. What is the percent oxygen in limestone?

Q: 5)An element cannot A) be part of a heterogeneous mixture B) be part of a homogeneous mixture C) be…

A: Given An element cannot _____________

Q: nd contains 12.4g of hydrogen. What is the percent by mass of hydrogen in the compound?

A: Given A 37.1 g sample of an unknown compound contains 12.4g of hydrogen. What is the percent by mass…

Q: 8.-Classify each statement as a law, a theory, an experiment, a hypothesis, an observation Birds…

A: Bird evolved from dinosaurs.Hypothesis provides a tentative explanation for observations. Hence, the…

Q: What is being represented by the picture below? * a mixture of compounds being physically separated…

A: 1.) To determine the nature of change , we would see what type of substance are on left side and…

Q: the label on an ocean spary cran-raspberry drink list 30g of surgar in 240mL of drink. I weighted…

A: Percent composition =Mass of solute Mass of solution×100%

Q: One pound of sulfur combines with one pound of oxygen to produce a gas. What is the percent by…

A: Mass of sulphur = 1 pound Mass of oxygen = 1 pound

Q: True or False  1) A 10 cm3 piece of magnesium will have a greater mass than a 10 cm3 piece of zinc.…

A: Given, Volume of Magnesium = 10 cm3 Density of Magnesium = 1.7gmL Volume of Zinc = 10 cm3 Density of…

Q: A typical recipe for a hot toddy (a drink often used as a cold remedy) is to mix hot water with…

A: The amount of energy absorbed by 16 oz. of water is 33 kcal. The amount of hot water mixed with 1.5…

Q: Aspirin is composed of 60.0% carbon, 4.5% hydrogen, and35.5% oxygen by mass, regardless of its…

A: Given compound is aspirin.  It is said to contain 60.0 % carbon, 4.5 % hydrogen and 35.5 % oxygen.

Q: Classify each substance by composition, first as a mixture (MX) or a pure substance (PS): zinc…

A: Zinc - pure substance  Toothpaste - mixture Corn oil - pure substance  Smog - mixture

Q: Why do physical properties play a role in chemistry if they do not involve any chemical changes?

A: I

Q: What percent (%) of 5.0 x 10-3  is 6.4 x 10-5?

A:

Q: A cheap reliable fertilizer, NH4NO3, adds nitrogen to the soil. If you add 48.5g of fertilizer to…

A: In order to find the amount of nitogen added to the soil we first write down the given data: Mass of…

Q: 1. What is the sum of 89.332 g and 1.1 g? a. 90.4g b. 90.432g C. 90.0g d. 90.43g

A: The significant figures of a given number are those significant digits, which express the meaning…

Q: a combustion reaction, 33.5 g of hydrocarbon reacts with 96.0 g of oxygen to produce water and…

A: The process in which an organic substance like a hydrocarbon reacts with oxygen from air to give out…

Q: Aluminum bronze contains 92.0% copper and 8.0% aluminum. What maximum mass of aluminum bronze can be…

A: Given: Aluminum bronze contains 92.0% copper and 8.0% aluminum.  Mass of Copper =73.5 g Mass of…

Q: 1. Every three times I clean my bedroom, my mother makes me an apple pie. If An apple pie requires…

A: Note: According to our guidelines we are supposed to answer only one question. Kindly repost other…

Q: A student performed an experiment to determine the percent water in a sample of food and collected…

A: Given: Mass of empty watch glass = 43.5245 g Mass of watch glass and undried food = 50.6270 g Mass…

Q: there is a mole of water in a beaker. A student measures the weight of the 1 mole of water of 18.02…

A: Mole is the amount of the substance that contains the same number of particles or atoms or…

Q: How much does it weigh in grams

A:

Q: 90.0 grams of salt is added to 150.00 grams of water, find the mass percent of WATER (watch sig…

A: Given: Mass of solute (salt) = 90.0 g Mass of solvent (water) = 150.00 g The total mass of the…

Q: Part A The American Dental Association recommends that an adult female should consume 3.0 mg of…

A:

Q: Air is homogeneous because * A: there is not blue air nor red air. B: it is a gas. C: the…

A: When two or more compounds come into contact without undergoing a chemical change, a mixture is…

Q: Liposuction is a technique for removing fat deposits from various areas of the body. How many…

A:

Q: A dietary supplement for calcium contains 600 mg of CaCO3 per tablet. How many grams of calcium are…

A:

Q: Hydrogen has also been considered as an alternative fuel for vehicles designed to combust hydrogen…

A: Given that a hydrogen engine can achieve 80 miles per kilogram of hydrogen gas. Thus, mass of…

Q: What is the mass of 74.5 Liters of gascous Lead I oxide? What is the mass of 50.0 grams of O;?

A: In international system of unit, there are seven basic units. Out of those seven unit Mole is one of…

Q: What does it mean when a substance is denser compared to another substance?

A: Note: According to our guidelines we are supposed to answer only one question.  Kindly repost other…

Q: Daniel Harris has always enjoyed eating tuna fish. Unfortunately, a study of the mercury content of…

A: According to EPA, the recommended Hg per kg of body weight should be at maximum of 0.1 μg per day…

Q: Is sugar an element or a compound? C12H22011 Is water an element or a compound?

A: An element contains same type of atoms. A compound contains different types of atoms.

Q: 2) Which of the following is intensive property? A. The amount of energy produced upon burning…

A: Intensive property is the property of matter which is specific and doesn't change with the amount…

Q: 1 What is chemistry? A. The study of composition of matter. B. The study of the behavior of matter…

A: Chemistry is the branch of science that deals with matter's composition and properties. Hence option…

Q: The EPA limit for lead in bare soil for children’s play areas is 400 ppm by mass. A contractor is…

A:

Q: A sample of lead ore has a density of 8.80 g/mL. It is composed of two lead compounds: lead oxide,…

A: Density of lead oxide = 9.10 g/ml Density of lead selenide = 8.10 g/ml Density of lead ore = 8.80…

Q: f 5.00 lb of potatoes costs $3.60, how much would 1.30 kilograms of potatoes cost?

A:

Q: Part A.Calculate the percent carbon in fructose, C6H12O6 Express your answer are using to decimal…

A: Answer :-  A) The percent Carbon in Fructose, C6H12O6 =  40.00%  B) The percent Hydrogen in…

Q: The mass of a test tube and hydrate was 35.2755 grams. The mass of the empty test tube was 23.7726…

A: When a molecule contains the water molecules attached to it in a specified number, then the molecule…

Q: A nutrition table lists apples with a potassium content of 4600 mg/pound. Assume an average apple is…

A: According to the given data, Mass of an average apple = 75.0 g Because, 454 g = 1 poundMass of an…

Q: A 3.53-gg sample of aluminum completely reacts with oxygen to form 6.67 gg of aluminum oxide. Use…

A: Mass of aluminum in the sample is 3.53 g. Mass of aluminum oxide is 6.67 g.

Q: Linus Pauling (Recipient of two noble prizes one for chemistry and another for peace)Wrote a book,…

A: Given, one 500.5 mg tablet contains 20% by mass Vitamin C. The mass of vitamin C in one 500.5 mg…

Q: how many Br2 molecules are present in a 1.0-mL sample of pure liquid bromine?

A: Number of moles = mass/molar mass  1 mol contains 6.022 × 1023 molecules

Q: What is the price of 1 g of mercury? $ What is the price of 1 cm³ of mercury? $ marcury?

A:

Q: How many grams of mercury would be contained in 15 compact fluorescents light bulbs?

A: A compact fluorescent light bulb contains 3-5 mg of mercury.  Bulbs with eco-friendly label contain…

Q: 9. Wolf teeth cost $28 per kg from Mr. Topango. An average wolf tooth weighs .55ounces. If you give…

A:

Q: Question 3

A: Copper is an element having symbol Cu and aluminum is an element having symbol Al.

Q: A medium sized carrot weight 61 g and contains 6 g of carbohydrate. What percent by mass of the…

A:

Q: ) 4.184 J g-1 °C-1 × 114.9 × 103 mg × (32.60 °C – 11.8 °C) = ______________

A: Given, 114.9×103 mg = 114.9×103×10-3 g.  (32.60-11.8)°C = 20.8°C

Q: Use iced tea with and without ice cubes as examples to explain homogeneous and heterogeneous…

A: Heterogeneous mixture: A mixture in which components combine to give a non-uniform composition is…

Q: Aluminum-Lithium alloys have been developed by aircraft industry to reduce the weight and improve…

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.