A chemist has one mole of an unknown molecule. The mass of this sample is 184.1 grams. After doing some tests, the chemist determines that the molecule has 2 bromine atoms in it and one other atom she cannot identify. In other words, the molecule's formula is XBr2, where X is unknown. Based on the mass of the sample, what is atom X?

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: PXCI, where x stands for a whole number. Measurements also show that a certain sample of the unknown…

A:

Q: You gave 4.5 × 1025 aluminum atoms . How many moles of aluminum atoms do you have?

A:

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

A:

Q: Suppose you have a sodium sample weighing 11.42 g. What mass of potassium would you need to have the…

A: Given, Mass of Na =11.42 g

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

A:

Q: A 1-carat diamond is pure crystaline carbon and has a mass of 0.200 g.Which contains more carbon…

A:

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

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: The atomic weight of bromine is 79.904, yet no atom of bromine weighs 79.904 amu. Why is this true?

A: Given : The atomic weight of bromine is 79.904, yet no atom of bromine weighs 79.904 amu.

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: A pure titanium cube has an edge length of 2.85 inin . How many titanium atoms does it contain?…

A: Edge length of pure titanium cube = 2.85 in Density  of titanium = 4.50 g/cm3

Q: If a sample contained 9.65 x 1023 atoms of iodine, how many grams would this be? Round to one…

A:

Q: A sample of ammonia Nh3 contains 1.2 X 1023 hydrogen atoms. How many NH3 molecules are in the…

A: Ammonia (NH3) is a molecule that exists as a gas at Standard temperature (298 K). It contains atoms…

Q: A sample of C3H8C3H8 has 8.88×1024 H8.88×1024 H atoms. (1) How many carbon atoms does the sample…

A: We have given the sample that contain 8.88×1024 H atoms.   1 Mole of  C3H8≡  3 Mole of Carbon   and…

Q: White sand is made of silica (silicon dioxide, or SiO2), which has a density of 2.20 g/cm³. How many…

A:

Q: Determine the moles of barium in each sample. Be sure each of your answer entries has the correct…

A: Part 1) 731. g Ba:To find the number of moles of barium, we'll divide the given mass by the molar…

Q: chemical formula

A:

Q: Fill in the blank. One mole of any atomic, ionic or molecular substance is it's respective atomic,…

A: The atomic mass of an element is equal to the mass of one mole of that element. The molecular mass…

Q: A) Suppose one molecule of Chlorophyll X contains 5 oxygen atoms. Chlorophyll X is 8.95% oxygen by…

A: Molecular mass of Chlorophyll X can be found out by using the mass percentage of Oxygen and number…

Q: A sample of C3H8C3H8 has 4.48×1024 H4.48×1024 H atoms. How many carbon atoms does the sample…

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: Aluminum (Al) is element 13 on the periodic table. A sample contains 4.56×1022 atoms of Al.…

A: In this question, we will calculate the amount of Al in grams unit.  You can see below.

Q: A sample of hydrogen has a mass of 40.2 grams.  How many H atoms are there in the sample?   How…

A: Given that,mass of hydrogen = 40.2 gMolar mass of hydrogen = 2.016g/molmoles of hydrogen = mass of…

Q: 6.90 x 1024 formula units of sodium nitrite, NaNO₂ Express your answer with the appropriate units.…

A: Multiple  questions

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: a)Using the data provided, determine the mass percent of water and the mass percent of anhydrous…

A: Given, mass of hydrated copper (II) sulfate: 131.4g mass of anhydrous copper (II) sulfate: 130.26g…

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: Unknown element, Element X, exists in nature as two isotopes: ^{351}351 X has a mass of 350.9196 u…

A: Average atomic mass=∑i=1n (mass of ith isotope)(%abundance of ith isotope)100 where 'i'…

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

A: given formula = Al2Clx

Q: White sand is made of silica (silicon dioxide, or SiO2), which has a density of 2.20 g/cm3. How many…

A:

Q: A 22.55 g sample of alum is heated in an oven to drive off all the water from the solid. Determine…

A: Answer

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: Calculate the mass of each sample. a. 1.05 × 10²26 atoms of neon, Ne(g)

A: 1 mole of atom = 6.022 × 1023 atoms

Q: Determine the mass in grams of 7.75 x 1021 atoms of carbon. (The mass of one mole of carbon is 12.01…

A: Given,the mass of one mole of carbon = 12.01 gNumber of carbon atoms = 7.75×1021 atomsHere, we are…

Q: A hypothetical element exists as two isotopes: I = 85.50 amu and II = 88.70 amu. If the percent…

A:

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: What is the mass in grams of 1.37 x 10^24 atoms of nickel? ______ grams How many nickel atoms are…

A: Calculate mass and number of atoms of Nickel in the given data in the question---  Value--  Avogadro…

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.