Periodic Table are the most important for human life.  2. The combining ratio of a compound tells you how many atoms of each element are combined in the compound.  3. The combining ratio of 1:2 in the compound CO2 tells you that this compound is formed by the combination of one gram of

Q: The following equations represent chemical reactions. Chemical Reactions 1 2Na + 2H2O 2 H2 + O2 +…

A: The reaction which is blance follows law of conservation of mass i.e total mass remains same or…

Q: In the chemical formula Mg(NO3)2, the numerical coefficient is equal to…

A: Chemical formula  are representation of molecules or compounds by fixed proportions of elements in…

Q: Thinking of the individual charges of the metal and polyatomic ions present in Ca5(PO4)3OH, can you…

A: Given, the formula of the compound is Ca5(PO4)3OH.

Q: In the figures below, two types of atoms are represented by small white circles and large red…

A: Law of definite composition states that a given compound always contains its constituent atoms in…

Q: One ounce of dark chocolate contains 0.25 g theobromine, a compound related to caffeine. Calculate…

A: GivenMass of theobromine = 0.25 gChemical formula of theobromine =C7H8N4O2Molar Mass of theobromine…

Q: The cullinan diamond was the largest natural diamond ever found (january 25 , 1905 25, 1905). It…

A: Use formulas Mole=mass÷molar mass Total atoms=mole×6×1023 MOLAR mass of diamond= 12g/mol

Q: Please solve a, b, c thank you

A: Lead(IV) selenite is Pb(SeO3)2  Molar mass of compound = 461.2 gm/mol  Mass of compound = 12.47 gm

Q: A student solved the following question incorrectly: How many NO2 molecules are there in 72.0 g NO2…

A:

Q: Heavy water is produced by using the rare isotope deuterium, Nwhich hydrogen-2 (H) replaces the…

A: Given,

Q: 1.aDo a mole of Na and a mole of NaCl contain the same number of Na atoms ? Explain your answer .…

A: Same moles of any particle will have same number of that particles .

Q: 2. Methane can be disposed into two simpler solutions, hydrogen and carbon. Therefore, methane  a)…

A:

Q: 1. When 28.0grams of CO is analyzed, it is found to contain 12.0g of carbon and 16.0g of oxygen. How…

A: Hey, since there are multiple questions posted, we will answer first question. If you want any…

Q: Indicate the symbols of elements and formulas of inorganic compounds. 1. Zinc dichromate =…

A: 1. Zinc dichromate: Symbols of elements: Zinc=Zn Chromium=Cr Oxygen=O Chemical formula: ZnCr2O7

Q: Identify composition of the substance with each formula as one of the four: molecular, ionic,…

A: The ionic bond is an electrostatic attraction force, formed between the ions and it is a strong…

Q: 1. Acetylene, a gas used in welding torches, has two carbon atoms and two hydrogen atoms in a mole…

A: 1) Acetylene Molecular formula - C2H2

Q: A novel compound with a molar mass of 674.7 g/mol was isolated from bacterial cells. This compound…

A:

Q: 1. Which of isotope oxygen (0) is the most abundant? What is its percent abundance? 2. How could you…

A: 1) O816 is the most abundant isotope of oxygen according to the given data with  a 99.7599…

Q: A mole refers to the amount of substance which can be an atom, molecule, ion and other particle or…

A: Deck of cards , Bundle of sticks and piece of paper does not relate to concept of mole because it…

Q: Ammonium nitrate is a common fertilizer. Agronomists base the effectiveness of fertilizers on their…

A: Formula of ammonium nitrate = NH4NO3 Molar mass of N = 14 g/mol Molar mass of O = 16 g/mol Molar…

Q: Choose the correct statements for a single molecule of the compound NH,NO3: I. There are 2 nitrogen…

A:

Q: use circles to indicate the four different groups for carbon Ca and squares to indicate the four…

A: Solution -

Q: Element X forms three different compounds with element Y. Information about these compounds is…

A: We have to determine the formula of compound 2 and 3 such that element X forms three different…

Q: The number of Cr atoms in a 26.0 g sample of chronium is x. How many atoms, expressed in terms of x,…

A: Number of moles = mass in gram / molar…

Q: 1. How many grams of Si are present in 1.49 grams of silicon dioxide ? grams Si. 2. How many grams…

A: Molar mass is defined as an average mass of atoms present in the chemical formula. It is the sum of…

Q: Q11 (B) Calculate the mass of 941 molecules of Al2(SO4)3.

A: Molecular Mass : The molecular mass of any compound is defined as the mass of one mole of that…

Q: Calculate the formula mass of each compound. Keep at least one decimal place in atomic masses from…

A: The formula mass of any compound us the sum of the masses of all the atoms present in the compound.…

Q: Circle the best correct answer for the following multiple choice questions: 1) How many aluminum…

A:

Q: How many carbon atoms are in a 1.21 carat diamond? 1 carat = 200 mg (exactly)

A: Given, mass of diamond = 1.21 carat  1 carat = 200 mg  we are asked to calculate that how many…

Q: Analysis of two compounds shows that they contain only lead and iodine in these amounts: Compound A:…

A: By calculating the molar ratio, with the help of unitary method, the formula of the compounds can be…

Q: A: Read each statement below carefully. Place a T on the line if you think a statement is TRUE.…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: When molecules are represented by molecular models, what does each sphere represent? How big is the…

A: Molecular model is the complete way to specify a given compound.

Q: A sample of ammonia has a mass of 96.3 g. How many molecules are in this sample? A. 5.65 molecules…

A: One mole of any substance consists of 6.022×1023 molecules. The number of moles of a substance can…

Q: A sample of ammonia (NH3) has the mass of 56.6 g.  How many molecules are in this sample? Group of…

A: The formula for ammonia is NH3. Now we can calculate the mass of 1 mole of NH3. N = 14.01 H = 1.008…

Q: Find the mass of 1 molecule of NaH in gram. а. 23.99 b. 3.98 x1023 С. 12 d. 3.98 x10-23

A: Atomic mass of sodium (Na) and hydrogen (H) atoms are as follows; Atomic mass of Na = 22.99 g/mol…

Q: Calculate the mass of 816 molecules of Cu(NO3)2.

A: We know , 1 mole of substance = 6.022 × 10²³ Molecules By using this relation , we can calculate the…

Q: 1. Calculate the mass percent of NaHCO3 based on the manufacturer's list of ingredients: 325 mg…

A: we are given the components Aspirin=325 mg Citric Acid=1000mg NaHCO3=1916mg now we need to calculate…

Q: of Chlorine (C) is the most 1. Which isotope abundant? What is its percent abundance? 2. How could…

A:

Q: 1. Write the molecular formula of each compound. a) The phosphorus-sulfur compound that is…

A: Molecular formula of a compound is written by the number of atoms in subscript to the type of atom…

Q: ompare sugar (C12H22O11) to Carbon (C) , Hydrogen (H) and Oxygen(O) 1) What are the similarities…

A: Atom- Atom is smallest constituent unit of matter. It characterizes an element. It is made up of…

Q: How many carbon atoms are in a pure diamond (all carbon) with a mass of 52.00 mg? O A. 4.330 x 100 O…

A: Diamond is made up of pure carbon given , mass of diamond =52 mg STEP 1 conversion mg unit to gram…

Q: Classify each element as atomic or molecular.a. neon b. fluorine c. potassium d. nitrogen

A: a. The elements that have single atoms as their naturally existing basic units are known as atomic…

Q: Decide whether each statement is true (T) or false (F). Place your answer in the blank space given.…

A: Scientific theory states that the atoms in today's plastics were parts of microscopic plants and…

Q: With explanation please

A: In chemistry, the term empirical formula can be defined as the simplest positive ratio of the number…

Q: Chemical formulas can be written as empirical formulas, molecular formulas, or structural formulas.…

A: Given: An Empirical formula gives the simplest, whole-number ratio of atoms in a compound. A…

Q: A. Sentence Completion. Complete each statement with a word/ concept in the blank of the item. 1. is…

A: The chemical formula defined the number of atoms or the type of atoms present in the compound. The…

Q: Calculate the mass of dinitrogen tetroxide N2O4 that contains a million ×1.000106 oxygen atoms.

A:

Q: The molecular mass of a compound containing 75.0 % carbon, 10.5 % hydrogen, and 14.6 % nitrogen is…

A: given 75.0 %  C 10.5 %H  14.6 %N molecular mass 384.6.

Q: 12. Which of the following definitions of formulas is correctly stated? A. An empirical formula is…

A: