If a gold alloy contains 20% silver and 5% copper, what is the percent of gold in the alloy?

Q: Determine the molar mass of NaAlSi3O8. Use the abbreviated form of the unit in your answer and round…

A: Molar mass of  Na :- 23 g/mol  Al :- 27 g/mol  Si :- 28 g/mol  O :- 16 g/mol  These all data are…

Q: 50. A 56-g sample of iron reacts with 24 g of oxygen to form how many grams of iron oxide?

A: Interpretation - A 56 g sample of iron reacts with 24 g of oxygen to form iron oxide. The grams of…

Q: emolality

A:

Q: which of these would most likely be an gram equivalent mass of copper?

A: 1 Faraday is defined as the amount of electric charge responsible for deposite or dissolve 1 gram…

Q: what the word mean A number written after an element’s symbol in a chemical formula

A: When a molecule is formed by joining two or more atoms together, a chemical formula is shown to show…

Q: Glucose has the formula C6H12O6. What is the percent composition of oxygen in glucose to three…

A: The percent composition of oxygen in glucose is to be calculated.

Q: Example: Identify the following as a pure substance or mixture. (Answer: This is a pure substance…

A: Pure substance is defined as the sample containing only one type of molecules of the compound.

Q: How would you know  the volume of the groundnut to the mass or weight of flour for coating the…

A: We will know the volume of the groundnut to the mass or weight of flour for coating the groundnut to…

Q: Bauxite is the ore that aluminum comes from. Its” formula is ( Al2O3) What is the percent Aluminum?

A: Given Moleular formula = Al2 O3  atomic mass of Al  = 26.98 gmol-1 atomi mass of O  =   15.999…

Q: ne number of atoms

A:

Q: Calculate the number of vanadium atoms in a 50.0g sample of vanadium(V) oxide V2O5.

A: Mass of V2O5 = 50 g Molar Mass of V2O5 = 181.88 g mol-1

Q: Which common inexpensive metal was more valuable than gold in the nineteenth century?

A: Solution:       Aluminum is considered as the third most abundant element in the earth crust after…

Q: If 20 g of calcium are found in the compound calcium chloride, how many grams of chlorine are…

A: Molecular formula of calcium chloride: CaCl2 Molar mass of Ca: 40.08 g/mole Molar mass of Cl: 35.45…

Q: Please answer correct. What is the molar mass of the following compound? Include the mass to 2…

A:

Q: The nickel is comprised of two metals, nickel and copper. Surprisingly, the coin is only 25% nickel.…

A: The coin is comprised of nickel and copper. The mass percentage of nickel in the coin is = 25% The…

Q: yleld of carbon dioxide

A: CH4   +    O2            ----------->       CO2     +            H2O…

Q: A hydrate initially weighs 5.672 grams and is heated.  After heating, it weighs 4.483 grams.…

A: Given ,Initial hydrate weighs = 5.672 gAfter heating weighs = 4.483 gSo,mass in water form = Initial…

Q: ne number of grams of krypton in th

A: In this question we have to determine the number of grams of Krypton in the mixture with above…

Q: For the molecular compound carbon tetrachloride, what would you multiply "molecules of CCl4" by to…

A: Given : Compound is carbon tetrachloride i.e CCl4. And number of molecules of CCl4 is given. To Find…

Q: Use the web to determine the mass of a steel beverage can from the 1970s and the mass of a modern…

A: Mass is a property, which represents the amount of substance present in a sample and it is generally…

Q: A 33.5 metric ton sample of ore yields 2.95 metric tons of iron. What is the percent of iron in the…

A: Given that,Mass of ore sample = 33.5 metric tonMass of iron = 2.95 metric ton

Q: Use the web to determine the mass of a steel beverage can from the 1970s and the mass of a modern…

A:

Q: Kenya has a pile of salt on the counter. She uses a pinch of it for a meal . What physical…

A: The properties of a substance which can be easily measured and which defines the state of a system…

Q: An alloy contains 56 g of pure silver and 22 g of purecopper.What is the percentage of silver in the…

A: Given data contains, Mass of pure silver is 56 g. Mass of pure copper is 22 g

Q: I have the chem 101 app and the question is:     An atom of a particular element has a volume of 7.8…

A: The unit of given volume is to be converted from m3 to cubic nanometres (nm3).Volume = 7.8 ×10-31 m3

Q: the atoms of elements or molecules of compounds when a chemical change occurs and when a physical…

A: Chemical reaction and chemical change: A chemical reaction bonds between atoms are broken and new…

Q: molecular diagram represents a pure substance or a mixture. If it represents a pure substance,…

A: The given molecular diagram is a representation of the carbon compounds in the Ball and sticks…

Q: Are the mass’ on the periodic table given in grams or AMU?

A: Mole concept: The number of molecules or atoms present in the one mole of the substance is equal to…

Q: the ascorbic acid found in one 500.0 mg tablet. What is the percent vitamin C by mass in the tablet?

A:

Q: Which of the following best describes the system depicted in the diagram? Mixture of elements…

A: We have to say about the diagram.

Q: Classify the following molecular diagram:      element            compound            homogeneous…

A: The given terms are explained as follows: element -  represented by single atom compound -…

Q: If the same amount of electricity that is used to produce 500g copper metal is used to produce…

A: Number of moles can be determined by dividing the given mass of the atom or molecule by the molar…

Q: What is the mass of a sulfur dichloride molecule ? grams

A: Mass of sulfur di chloride is the summation of molecular weight of one atom of sulfure and two atoms…

Q: A food contains 131 kcals, 24 grams carbohydrates.  What  % of kcals are from carbohydrates?

A: Given, Total energy in a food = 131 kcals mass of carbohydrate = 24 g % of kcals are from…

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

A: Mass of water is equal to the mass of the hydrated salt test tube and the mass of anhydrous salt…

Q: High-density lipoprotein (HDL) cholesterol is the “good” cholesterol because adequate levels reduce…

A:

Q: What is the mass of a phosphorus trichloride molecule ? grams

A: Phosphorus trichloride = PCl3  Mass of PCl3 = Molar mass of PCl3

Q: A compound is a pure substance whose smallest representative is identified as?

A: Applying definition of compounds.

Q: C. How many grams of water are С.

A:

Q: Mixture of water and POTASSIUM CARBONATE is an example of Homogeneous mixture Select one: O True O…

A: A homogeneous mixture is a mixture in which the composition of the mixture is uniform i.e same…

Q: Which isotonic has largest radius?

A: Which isoelectronic has largest radius?

Q: a. The "grain" unit of mass is commonly used to define the amount of aspirin in a commercial tablet.…

A: Grain is the unit of weight. A tablet of aspirin consists of 5 grains. The mass of one grain of…

Q: Natural gas is odorless; to alert people to gas leaks, the gas company inserts an additive that has…

A: The speed of the gas molecule is inversely proportional to the mass of the gas molecule. The…

Q: You think is the most important concept you have learned in percentage composition that is most…

A: The value of percentage composition is represented in terms of percentage..

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: A _____ is something that has a definite composition.

A: The study of the composition, structure and characteristics of matter; the processes which matter is…

Q: Ocean water contains 3.4 sodium chloride by mass. What made of ocean water in gram contains 13.2 g…

A: Number of moles of a chemical compound is used to measure the amount of compound in the given…

Q: 31. is the money left after all costs and expenses of a business are paid.

A: Net profit is the amount of money left over after paying all of the business expenses. This net…

Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.