4) A 1990 penny has a mass of 2.545 g and produces a copper shell with a mass of 0.064 g. Refer to Example Exercise 1 and calculate the percentage of (a) copper metal and (b) zinc metal in the penny.

Q: I need to know which is the mass of crucible and kid with magnesium please

A: A question based on analytical chemistry, which is to be accomplished.

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: A student obtains 50.00 grams of calcium hydroxide.  Determine the number of hydroxide ions present…

A: The chemical formula of calcium hydroxide is Ca(OH)2. One molecule or unit of it contains one…

Q: Determine the mass in grams of 5.28 × 10²¹ atoms of barium. (The mass of one mole of barium is…

A: Given, Number of barium atoms =5.28×1021 atomsmass of one mole of barium =137.33 gwe are asked to…

Q: Please help me in the same form the question is if you can write it the same way pleaseeeee

A: Questions are based on mole concept. Solved in step 2 and 3.

Q: A certain compound contain 59.9 g of carbon, 8.06g of hydrogen, and 32.0g of oxygen. Another sample…

A: Now, mass percent is defined as the mass of the substance divided by the total mass of the sample ,…

Q: If 1.00 g of gray zinc powder reacts with 0.49 g of yellow sulfur powder, what is the mass of the…

A: Given : Mass of gray zinc powder = 1.00 g Mass of  yellow sulfur powder = 0.49 g Mass of ZnS = ?

Q: In today's laboratory you are going to mix elemental copper and elemental sulfur to form a…

A: molar mass of Copper = 63.55 g/mol The relation between the mass of a substance and the number of…

Q: An unknown compound has the following chemical formula: where x stands for a whole number.…

A: In this question, we have to find the chemical formula of C2Fx. Given: Moles of carbon= 2.71 Moles…

Q: 1.2x10^23 gold atoms calculate into mass, in grams

A: Given:Number of gold atoms = 1.2 x 1023 atoms.Molar mass of gold (Au) = 199.97 g/mol.

Q: Analysis of a 29.1 g sample of water revealed a mass percent for lead of 4.35%. Calculate the number…

A: Mass percent of lead is equal to the mass of lead divided by the mass of water multiplied by 100.

Q: A lab requires the use of 76.6 g of ammonium oxide. Determine the number of cations in the sample…

A: Given data,mass of ammonium oxide=76.6gWe know,1 mol of substance have 6.022×1023atoms

Q: An unknown compound has the following chemical formula: Fe(NO,), where x stands for a whole number.…

A: Molecular formula: In a molecular formula we describe the number of atoms of all the elements…

Q: 10) In a round-bottom flask, a chemist completely reacts 4g of hydrogen with 25g of chlorine. What…

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

Q: Mass of empty evaporating dish + watch glass 65.362 g B Mass of dish + watch glass + initial solid…

A: Given A) Mass of empty evaporating dish + watch glass =  65.362 g B) Mass of dish + watch glass +…

Q: A certain compound X is composed of 70.53% carbon, 13.02% hydrogen, and the remainder is nitrogen.…

A: Given values: Percentage of carbon = 70.53 % Percentage of hydrogen = 13.02 % Percentage of nitrogen…

Q: Calculate the mass of hydrazine (N₂H4) that contains a trillion (1.00 × 10¹2) nitrogen atoms. Be…

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

Q: 4. A student obtains the following data. mass of clean, dry and empty crucible mass of crucible with…

A:

Q: Analysis of a 31.7 g sample of water revealed a mass percent for lead of 3.3%. Calculate the number…

A: Analysis of 31.7 g of water was done and the mass percentage of lead was found to be 3.3%,

Q: According to the law of conservation of mass, the total of the masses of the reactantsImmersive…

A: The chemical reaction follows the law of conservation of mass. According to the law of conservation…

Q: A) a 10.00g unknown sample with a formula of CxHY was analyzed by combustion analysis. The sample…

A: The values are given as follows:

Q: (c) Vitamin C contains carbon, hydrogen and oxygen only. It is 4.579% by mass of hydrogen. One…

A: The empirical formula is the chemical formula of any compound that represents the proportions of…

Q: A 2.865 g sample of Iron (III) Chloride hydrate FeCl3∙xH2O was heated at 150°C until a constant mass…

A: GivenMass of FeCl3 .XH2O (Hydrated Sample) = 2.865 gMass of Dehydrated sample =FeCl3  = 1.719 gMolar…

Q: help please answer in text form with proper workings and explanation for each and every part and…

A: 1. Determine the recommended daily allowance (RDA) of iron in the US. Since RDS depends on many…

Q: An unknown compound has the following chemical formula: Al,Cl where x stands for a whole number.…

A: given formula = Al2Clx

Q: a chemist has 19.50g alcohol. what is the volume of the sample, what additional information is…

A: The volume of a given liquid is defined as the amount of the space occupied by the liquid that fully…

Q: Mass of the crucible and cover Mass Difference from previous 34.78166g 134.70516" 34.7658 After 1"…

A: Intrdouction : We have to calculate the mass of magnesium ,oxide and magnesium oxide .

Q: Analysis of a 39.8 g sample of water revealed a mass percent for lead of 4.87%. Calculate the number…

A: Molarity is defined as “the mole of the solute per unit volume of the solution”. It is represented…

Q: (Incorrect) How many total atoms are in 80.7 g of copper(II)sulfate? Provide your answer in…

A:

Q: Sea salt is formed by natural evaporation of ocean water and contains 98% sodium chloride. The…

A:

Q: If 21.4 g of aluminum is reacted with 91.3 g of Fe2O3, the prodücts will be Al2O3 and iron. What…

A: Limiting reagent: In a chemical reaction, the reagent that totally consumed is known as a limiting…

Q: A chemist needs 1.25 moles of sugar to dissolve in 1 liter of water. How many grams of sugar will…

A:

Q: The formula for alum has 1 Al. How many units alum could be made from 7 Al atoms? Answer with a…

A: The molecular formula of alum is K2(SO4)·Al2(SO4)3·24H2O or KAl(SO4)2·12H2O

Q: Calculate the mass of carbon (in grams) in 366 g of acetic acid.

A: Given :-  Mass of acetic acid = 366 g  To calculate :-  Mass of carbon (in grams)

Q: (Mass of crucible and cover is 43.92 g. The mass of crucible, cover, and magnesium is 44.62g. Mass…

A: Magnesium reacts with oxygen to produce magnesium oxide which is white in color. 2Mg+O2→2MgO This…

Q: A sample of a compound is found to contain 21.82 g of carbon, 9.16 g of hydrogen, 20.42 g of oxygen,…

A: Mass of compound is,

Q: A pure copper sphere has a radius 0.925 in Part A How many copper atoms does it contain? [The volume…

A: we have to calculate the number of Cu atoms

Q: The mass ratio of chlorine to the mass of copper is equal to 5.5. Another sample of copper chloride…

A: Introduction: The above question can be solved by using law of constant proportion which states…

Q: A sample of carbon weighting 1.48 g was burned in an excess of air. The mass of carbon dioxide, the…

A: This can be calculated in context to the percent mass of carbon. The reaction occurring in the…

Q: How many moles of calcium do you have if you measure out 19.13 g of calcium? Enter your answer in…

A:

Q: 4. A student obtains the following data. 25.2246 g mass of clean, dry and empty crucible 25.3372 g…

A: Magnesium ribbon when burnt in air undergoes a chemical change and yields oxide of Magnesium. The…

Q: A student, Ken, is given a mixture containing two carbonate compounds. The mixture includes MgCO,…

A: Given: Percent by mass of CO32- ions in sample = 69.14 %

Q: A mole of lithium atoms has a mass of 6.941g. What is the mass in grams, of a single lithium atom?

A: Number of moles of any substance can be calculated with the help of molar mass of the substance and…

Q: Q 6. Calculate the molar mass of the following substances. (a) Ethyne, C2H2 (b) Sulphur molecule, S8

A: Molar mass of the substance can be define as the mass of one mole of a substance.

Q: At the edges of the paper which you happened to touch with sweated hands, what can you conclude…

A: Chromatography is totally based on capillary action. So if we hold the paper in the middle, then…

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.