A large number of molecules is called a an element b a compound c a mixture d Depends on the number of molecules e None of these

Q: а. NH3 NaCN H HCI b. Br EtO2c co,Et `CO2Et Br HCI NO NaOEt H20 c. E1cb OP

A: As per the regulations only the first three subparts of a question could be answered.

Q: 1) Determine the number of moles in each sample: a) 38.2g sodium chloride b) 36.5g nitrogen monoxide…

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Q: AB4(g) + 2 B2C(g) ⇌ AC2(g) + 4 B2(g) Kp = 21/62500

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Q: Predict the sign of ΔS for

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Q: The molecular formula of aspirin is C9H8O4. How many aspirin molecules are present in one…

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Q: 102.2 g NaCl = _______________ mol NaCl

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Q: O+Cl, (g) = PCI, (g)

A: Dear student I have given answer to your question in the image format.

Q: Which one of these are chemical change which ones are physical change? 6) Mg + HCl 7) NH4Cl + H2O

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Q: You have a chemical in a sealed glass container filled with air.  The setup is sitting on a balance…

A: The statement that is true has to be identified and the reason has to be explained.

Q: CACO; ® CaO + CO, In the chemical reaction shown above, the products are best classified as- O Two…

A: Element is a pure substance and is made up of only one kind of atoms.

Q: Fill in the coefficients needed to balance each equation.

A: A balance equation has the equal number of atoms on the left hand side as well as on the right hand…

Q: 2NH3(8)+302(8)+2CH4(g) 2HCN(g)+6H2O(g) kJ

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Q: The following picture represents.. Mixtures of elements Mixtures of compounds Molecules of elements…

A: What are the chemical species present in the following

Q: 1. Balance the following chemical reaction: C2H5OH • 02 --> CO2+ H20 2. Balance the following…

A: According to the Law of conservation of mass " all atoms of different elements must be equal on both…

Q: Classify these substances. More than one answer may apply in each case. N2 O heterogeneous mixture O…

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Q: A goldsmith wants to change the composition of 10 g 18K red gold (75% gold and 25% copper) into 60%…

A: 10 g 18 K red gold contains 75% gold + 25% copper

Q: 1. NaNO, H,SO, H,CO. NH2 J T CisH202 2. H;CO.

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Q: (a) 2H2O2(1) 2H20(1) + O2(g) (b) HCI(g) + NAOH(s) NaCI(s) + H2O(1)

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Q: Why are intensive properties useful for identifying a substance? A:They describe the amount of…

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Q: Mixtures and compounds vary in composition with the latter having a 1) compound. The components of a…

A: A mixture is a physical combination of two or more substances. For example, water and salt.

Q: Several students perform an esterification reaction to synthesize aspirin. The table below shows the…

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Q: Potassium chloride is a salt substitute. It consists of potassium cations and chloride anions.…

A: 1.Element are simple  form of matter , example Na. 2.ionic compound are the compound form by cation…

Q: (a) 2 Mg(s) + O2(g) → 2 MgO(s) kJ (b) 2 SO2(g) + 02(g) → 2 SO3(g) -139.9: kJ (c) 2 C,H2(g) + 5 02(g)…

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Q: Two samples of potassium chloride are decomposed into their constituent elements. One sample…

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Q: You have a sample of soil. Soil is a heterogeneous mixture. You separate the different size…

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Q: H+ He He+? H+B 3? 122Xe+? 54 Fe e + ?

A: Balance equation

Q: A heterogeneous mixture has uniformly distributed particles has not a uniform composition throughout…

A: Heterogenous mixture is the mixture in which the composition is not uniform throughout it means…

Q: How does increasing the temperature change the physical properties of an object? 0000 DUT a…

A: Increasing the temperature increases the average speed of the reactant molecules.

Q: C (s) + O2 (g) → CO2 (g) (b) N2 (g) + 2 O2 (g →2 NO2 (g) 2 NH3 (g) → N2 (g) + 3 H2 (g) (d) Cl2 (g) +…

A: Kp = Kc RT∆n

Q: substance. 3. А (An) 4. According to the law of be neither created nor destroyed during means…

A: (4) According to the law of __________, Matter can neither be created nor destroyed during a…

Q: how many grams of Cu(NO3)2 can be made from 25 grams of copper

A: The reaction involves,

Q: Cl2(g) 2HCI(g) AH = –184.6 kJ %3D | 2: O2(g) + 2 F2(g) AH = -49.4 kJ ΔΗ 3: 202(g) → 2NO2(g) AH…

A: Given,  Reaction,  N2 + O2 ---> 2NO  □H = 66.4 kJ Volume of N2 = 167 L Moles = Volume (L)/22.4…

Q: 7. What kind of a compound is KN and how do you know this? Draw a representation of three units of…

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Q: An analytical chemist measures the amount of Elements E, and E, in four samples of an unknown…

A: Since the unknown substance, X contains elements E1 and E2, it can be either a compound of E1 and…

Q: Mixtures are divided into two classes based O 1. mixtures and matter on their appearance. What are…

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Q: 0.848g of Na2B4O7.10H2O into a crucible. After hearing the sample for a short time and allowing the…

A: Na2B4O7.10H2O is known as borax.It is a hydrated crystal having 10molecules of water of…

Q: (d) 2 C(graphite) +202(g) → 2CO2(g) (b H2(g) + 1/2O2(g) → H₂O(1) (e) 2 CO2(g) + H₂O(l) → C₂H2(g) +…

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Q: 7. To make a ham sandwich, you choose to use 2 pieces of bread (B), 4 slices of ham (H), and 1 slice…

A: Given, Peices of Bread = 14 Slices of Ham = 24 Slices of cheese = 7

Q: 2NH3(g) + 3N20(g)4N2(g) + 3H,0(g) Clear All AHxn ASpxn >0 low T, 0 high T

A: Given that the reaction is exothermic. We will predict the given physical quantities as follows.

Q: For B D and E what is the equilibrium constant

A: Write equilibrium expression of the given reaction--

Q: Which of the following will be homogeneous mixture?    (A) All of them (B) N2 and Ar (C)…

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Q: A large number of atoms of the same kind is

A: Matter is classified into following types  1 Pure  substances        2. Mixture    1. In Pure…

Q: . ) HCN(aq)+ H2O(l)⇌H3O+(aq)+CN−(aq)HCN(aq)+ H2O(l)⇌H3O+(aq)+CN−(aq) Express your answers as…

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Q: y grams o

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

Q: 1. LIAIH, 1. NaN3 Y CN A 2. H20 2. H20, heat

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…

Q: A sample of a compound has a mass of 41.13g. The sample is found to contain 37.28g of carbon and…

A: Percent composition of the compound is described as the percent of mass of each component of the…

Q: H2N J a) i) NaNO2 HCI, ii) I2 b) i) NaNO2, HCI ii) KI Oc) KI O d) 12

A: Diazotization: The conversion of aromatic amines into its diazonium salt is called diazotization.

Q: Nitrogen ΔHof (kJ/mol) ΔGof (kJ/mol) So (J/mol K) N2 (g) 0 0 191.6 N (g) 472.7…

A: Given, Moles of N2 = 1.590mol

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.