A block of gold (Au) has the dimensions (I × b x h) = 0.7600 in x 8.558 mm x 1.816 cm. 1 in = 2.54 cm The density of gold at 20°C is 1.930 × 10º mg/dL. Calculate the number of gold (Au) atoms in this block of gold.

Q: Consider a mixture of 10 billion O2 molecules and 10 billion H2 molecules. In what way is this…

A: The 1st mixture contains 10 billion or 109 O2 molecules and H2 molecules. The 2nd mixture has 109…

Q: If 2 moles of water decomposes, the products that will form are 2 moles of hydrogen gas and one mole…

A: Given, Moles of water decomposed = 2 moles.

Q: Chemical analyses conducted by the first Mars Rover robotic vehicle in its 1997 mission collected…

A:

Q: A penny has a thickness of approximately 1.0mm. If you stacked Avogadro’s number of pennies one on…

A: The thickness of a penny=1.0 mm Avogadro's number=6.022 x 1023  Avogadro’s number of pennies were…

Q: The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of…

A: Molar mass of any element is equal to the atomic mass of that element in the unit of grams. Molar…

Q: Suppose you are given 2.50x 104 pg of aluminum sulfate, Al(SO4)ls (s) (density = 2.672 g/cm³) a. How…

A: a) In the first problem we need to find out the number of oxygen atoms present in the given sample.…

Q: Calculate the total number of N atoms in 23.8 g N2O5. O 2.65 x 1023 total N atoms O 9.31 x1023 total…

A:

Q: A 1/20 inch thick lead sheet is used for protection from medical X-rays. If a single lead atom has a…

A: To find out how many lead atoms thick the sheet is, we need to convert the thickness of the lead…

Q: e empirical formula of ti

A:

Q: 5.00 g of copper is reacted with 5.00 g of sulfur in a crucible and a compound composed of copper…

A: Mass percentage of substance is one of the ways to express composition of compounds. Mass percentage…

Q: Two elements, R and Q, combine to form two binary compounds A and B. In the compound A, 10.50 g of R…

A: The law of multiple proportions states that if two elements combine with each other to form more…

Q: Cryolite, Na3AlF6(s), an ore used in the production of aluminum, can be synthesized using aluminum…

A: Given information: Mass of Al2O3 = 12.4 kg Mass of NaOH = 57.4 kg Mass of HF = 57.4 kg

Q: A sample containing NaCl, Na2SO4, and NaNO3 gives the following elemental analysis: Na: 35.635…

A:

Q: A sample of mercury(I) nitride weighs 3.33 dg.  How many nitrogen atoms are in this sample?The…

A:

Q: A sample of C, H, contains 4.69 x 1024 H atoms. How many carbon atoms does the sample contain?…

A:

Q: Find the mass in grams of C3H8O (isopropyl alcohol) that would contain 5.44x10^25 C atoms.

A: The question is based on mole concept. We have to calculate mass of alcohol present in the given…

Q: an element has a density of 10.25 g/cm3 and ametallic radius of 136.3 pm. the metal crytsallizes in…

A:

Q: chemical formula

A:

Q: A certain organic compound has the formula C9H11O2.  A sample of this compound weighs 85.88 grams.…

A: The formula of the given organic compound is C9H11O2.  Mass of the compound=85.88 grams. The molar…

Q: Determine the mass in grams of 5.51 × 10²¹ atoms of arsenic. (The mass of one mole of arsenic is…

A:

Q: A sample of C,H, has 9.28 x 1024 H atoms. How many carbon atoms does the sample contain? number of…

A: The amount of substance is usually defined in terms of mole. The mole is the SI unit of the quantity…

Q: If the density of Al metal in aluminum is 2.699g/cm3, estimate the number of atoms/cm2 in a foil…

A:

Q: Determine the mass in grams of 7.21 × 10²¹ atoms of carbon. (The mass of one mole of carbon is 12.01…

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

Q: How many water molecules are in 6.00 raindrops? Assume that there are 20.0 raindrops in 1.00 mL of…

A: Density is defined as: It is the ratio of mass per unit volume 1 mole of any chemical species…

Q: Gold (Au) has a density of 19.32 g-cm-3. If a spherical gold nanoparticle has a diameter of 50 nm…

A: Density of Gold nanoparticle is 19.32 g/cm3 and its volume is 7*104 nm3.

Q: A 67.2 gg sample of a gold and palladium alloy contains 3.55×1023 atomsatoms . A) What is the mass…

A:

Q: You take three compounds, each consisting of two elements (X, Y, and/or Z) and decompose them to…

A: The problem belongs to the simplest ratio of masses.

Q: There are two gas compounds that are made out of element  A and B. This is the mass percentage of…

A: Given: Mass percentage: Compound 1: 30.43% A, 69.57% B Compound 2: 63.64% A, 36.36% B

Q: A sample of lead contains 8.88 x 1015 micrograms. How many atoms does this sample contain?

A:

Q: . An iron supplement is used to treat anaemia and 50 mg of Fe2+ is required per tablet. If the iron…

A: The question is based on quantitative estimation. we have to calculate how much compound is required…

Q: 2CUO (s) + C(s) → 2Cu(s)+ CO, ( If the student starts with 5.00 g of Carbon (C) how many grams of…

A: Given, Mass of C = 5.00 g  Mass of Cu = ?

Q: A nail is coated with a 5.49E-2 cm thick layer of zinc. The surface area of the nail is 8.27 cm2.…

A:

Q: Determine the mass in grams of 7.98 × 10²¹ atoms of carbon. (The mass of one mole of carbon is 12.01…

A:

Q: Determine the mass in grams of 4.38 × 10²¹ atoms of chromium. (The mass of one mole of chromium is…

A:

Q: Consider the following reaction N2 (g) + 3H2 (g) ? 2NH3 g If 1.10 x 10 g N2 is reacted with 500 x 10…

A: The given reaction is, N2 (g) + 3H2 (g) →2NH3 (g) Given that: mass of N2 = 1.10×103 g mass of H2 =…

Q: 3.7 × 10–4 kg of atoms to micrograms (μg).

A: Given information:Mass of atoms = 3.7×10-4 kg

Q: An atom of rhodium (RhRh) has a diameter of about  2.7×10−8cm2.7×10−8cm. How many RhRh atoms would…

A: Given : Diameter of Rh atom = 2.7 X 10-8 cm And the distance to be covered = 6.0 μm = 6.0 X 10-4 cm…

Q: Dichlorodifluoromethane (CF2CI2) is an Ozone-depleting substance. It belongs to a class of compounds…

A: Atomic Weight of C = 12.01g/mol Atomic mass of Fluorine = 19.0g/mol Atomic mass of Chlorine =…

Q: Consider the following table: Substance Density (g/mL) Gold (s) 19.32 Silver (s) 10.49 Lead (s)…

A: Density can be defined as mass divided by volume which is represented as; Density=MassVolume…

Q: Determine the mass in grams of 4.78 × 1021 atoms of chromium. (The mass of one mole of chromium is…

A: The number 6.023 × 1023 indicates the number of atoms or molecules in a mole of any substance is…

Q: What is the mass, in grams, of exactly 230 sodium atoms? Would it be the same answer only in grams?…

A: Steps to convert atoms to grams • Convert atoms to moles - Divide the number of atoms with Avogadro…

Q: A scientist is trying to discover information about an unknown metal in a compound. The formula for…

A: Step - 1Formula for the compound = XBr3Means in 1 mol of compound 3 mol of Bromine are…

Q: 6. A student performed an experiment in CT-STEM Lesson 2 (the chemical reaction is shown below). The…

A: According to the law of conservation of mass, mass can neither be created nor be destroyed.

Q: Determine the mass in grams of 7.94 × 10²¹ atoms of zinc. (The mass of one mole of zinc is 65.39 g.)

A: Given : Mass of 1 mole of Zinc = 65.39 g And number of atoms of Zinc = 7.94 X 1021 atoms.

Q: The mass of a single palladium atom is 1.77×10-22 grams. How many palladium atoms would there be in…

A: The mass of a single palladium atom is 1.77×10-22 grams. i.e 1.77×10-22 grams of palladium is equal…

Q: During an exam a student broke into a sweat and 4.23x1022 water molecules erupted on their forehead.…

A: Given, Number of molecules of water = 4.23x1022 molecules Volume of 1 drop of water = 50.0…

Q: 4. A student has been tasked to determine the percent water in thalium (III) nitrate, TI(NO3)3×H2O.…

A: On heating and consequently allowing the hydrate to stand in open air overnight allows the hydrate…

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.