What is the molar mass of sodium phosphate, Na3P04(aq)?   How many formula units of sodium chloride are present in a 3.500 mol sample? According to the law of definite proportions, how do elements always combine? Which formula could be an empirical formula?  What is the mass of only one atom of magnesium?  Which statement about the percentage composition of a pure substance is correct?  It is the combination of the percent masses of all elements in the compound.  When predicting the amount of product that is produced in a given reaction, which do you use?  Which substance contains the greatest amount (in moles)?  Methane, CH4(g), is a major component of natural gas. In a complete combustion reaction, 0.530 mol of methane reacts with 0.497 mol of oxygen gas as follows:

Q: 9. When a candle has been burning for an hour, its mass is less than it was at the beginning. (a)…

A: (a) Candles losses weight when it melts down. The mass of candle does not change during the melt…

Q: A mixture consisting of 11.6 g of calcium fluoride, CaF2, and 10.8 g of sulfuric acid, H2 S04, is…

A: Calcium fluoride reacts with sulfuric acid to form hydrogen fluoride and calcium sulfate. The…

Q: A molecule has the formula Na₂SOx, where X is a number of oxygen atoms. If the molar mass of the…

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

Q: The mole is a counting number that allows scientists todescribe how individual molecules and atoms…

A: Molecular weight of Cu(OH)2 = 97.562 gm/mol  Weight of Cu(OH)2 = 23.45 gm  Moles = weight/mol. wt. =…

Q: When I calculate 9.89g of caffeine (C8H10N4O2) into number of atoms I divide the mass by atomic mass…

A: Your calculations are on the right track, but it's important to understand the concept of the mole…

Q: Calculate the mass in grams of 1.23×10241.23×1024 molecules of methanol. The chemical formula for…

A: Given that, the molecules of methanol= 1.23 × 1024 Now, as per Avogadro’s law: 1 mol of methanol…

Q: Caffeine, a stimulant of the central nervous system, has the molecular formula C8H₁0N4O2. The molar…

A: Mass of 1 mole = molar mass 1 mole AB contain 1 mole A and 1 mole B

Q: Part 1: Calculate the mass percentage of N in N2O4. Report your answer to 3 significant figures.…

A:

Q: How many grams are there in 7.50 × 10 ^ 23 molecules of hydrochloric acid? 45.4 g

A: Firstly, we have to convert the given molecules to the moles and to go from molecules to moles…

Q: Calculate the mass in grams of 1.10 x 104 molecules of Sulfane, H2S. g NA= 6.022 x 1023

A: Mass of H2S in grams = 6.210 g

Q: Calculate the mass in grams of 1.90×10241.90×1024 molecules of Butane, C4H10.

A: Given:  Molecules of butane =1.90×10241.90×1024 molecules Standard data: The molar mass of butane…

Q: Calculate the number of O atoms in 0.0136 g of CaSO4 2H₂O. x 10 O atoms (Enter your answer in…

A: Answer: Given data: Mass of CaSO4.2H2O m=0.0136g

Q: A sample of pure alumina hydrate was obtained from a bag of flame retardant. A 5.000 g sample of the…

A: Weight of the hydrated aluminum oxide (Al2O3 . xH2O) = 5.000 g Weight of the anhydrous alumina (when…

Q: Calculate the mass in grams of 1.10 x 1024 molecules of Sulfane, H2S. g NA= 6.022 x 1023

A:

Q: How many CO2 molecules are there in 12.0 moles CO2?   How many moles NH3 contains 1.5 x 10 23 NH3…

A: a) Given : Number of moles of CO2 = 12.0 mol.

Q: Consider the reaction of solid P₄ and chlorine gas to form gaseous phosphorus trichloride. The…

A: The reaction given is P₄(s) + 6 Cl₂ (g) → 4 PCl₃ (g)

Q: Ascorbic acid is one form of vitamin C and is known to contain only carbon, hydrogen, and oxygen.…

A: Given,  The mass percent of Carbon = 40.91%  Hydrogen = 4.578% and Oxygen = 54.50% The mass of the…

Q: Consider the reaction of solid P4 and chlorine gas to form gaseous phosphorus trichloride. a) Write…

A:

Q: How many moles of Ca2+ ions are present in 7.52 · 1020 Ca(OH)2 formula units? Express your answer in…

A: Given : Number of formula units of Ca(OH)2 = 7.52 X 1020

Q: Sodium hydroxide, NaOHNaOH, is a strong base that is used in industrial synthesis and processes such…

A:

Q: What is the formula weight (in g/mol) of copper(II) nitrate trihydrate, Cu(NO3)2 3H₂O? Give your…

A: For the first question, we have to find the formula weight (in g/mol) of copper (II) nitrate…

Q: What is the mass of 2.9 × 10^26 molecules of dinitrogen pentoxide, N2O5(g)?

A: Molecules of N2O5 = 2.9 x 1026

Q: Calculate the mass in grams of 3.07×10243.07×1024 molecules of propane. The chemical formula for…

A: Given that : The number of molecules of propane = 3.07×1024 The chemical formula for propane is…

Q: Calculate the mass in grams of 6.12 mole Cu(NO3)2.

A: Solution stoichiometry is mainly based on the calculation of moles and volumes. These two values are…

Q: A grain of sand weighs 7.7 × 10−4 g. How many formula units of silicon dioxide, SiO2, are in one…

A: The mass of one formula unit of SiO2 = 60.08 g/mol

Q: What is the mass, in grams of 9.61 x 10^24 molecules of methanol (CH30H)?

A: Step 1:To find the mass of 9.61×1024molecules of methanol (CH3​OH), you first need to calculate the…

Q: Balance the following chemical reaction using the combination of a smallest possible set of whole…

A:

Q: Acetic acid (HC2H3O2) is the active ingredient in vinegar. Calculate the mass percent composition of…

A: The way of representation of concentration of an element in a compound or a component of a mixture…

Q: Assuming gasoline to be pure 2-methylhexane, C7 H16 (actually, it is a mixture of many substances),…

A: Molecules consumed per mile =  5.96 x 1023 molecules We need to find the mass of fuel.

Q: The reaction between potassium chlorate and red phosphorus takes place when you strike a match on a…

A:

Q: What is the mass in grams of 9.25 x 10^24 molecules of CO2? Write the answer in decimal form.

A:

Q: A balloon filled with neon gas, Ne, contains 9.870 x 1025 atoms. Use the molar mass of neon, 20.18…

A: Given,number of atoms of neon ( Ne ) gas = 9.870 x 1025 atomsmolar mass of Ne = 20.18 g/mol

Q: What is the molar mass of magnesium chloride, MgCl₂? Express your answer to four significant figures…

A:

Q: Calculate the molar mass of lead(II) nitrate, Pb(NO3)2(s)

A: The molar mass is the sum of masses of all the atoms present in compound.

Q: Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical…

A: Step 1:Step 2: Step 3: Step 4:

Q: When aluminum metals reacts with HCl(aq), the products formed are AlCl3(aq) and hydrogen. If 6.477…

A: Answer:- This question is answered by using the simple concept of stoichiometry which involves the…

Q: A mixture consisting of 11.6 g of calcium fluoride, CaF2, and 10.0 g of sulfuric acid, H2 SO4, is…

A:

Q: The balanced chemical equation is P₄(s) + 6 Cl₂(g) → 4 PCl₃(g). What is the mass in grams of…

A:

Q: %3D The mass of 2.21 x 1040 atoms of iron (molar mass = 55.845 g/mol) is O 2.78 x 104 g. 2.05 x 102g…

A:

Q: What chemical property of potassium chlorate did you use to design a procedure to determine the…

A: Interpretation-  Tell that chemical property of potassium chlorate which we use to design a…

Q: What is the molar mass for aluminum sulfate?

A: Number of moles = mass/molar mass  So, mass = moles × molar mass

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.