6) One mole of Ca and one mole of K contain A) The same number of protons B) Different amounts of atoms C) The same number of neutrons D) The same number of atoms E) The same mass in grams

Q: The density of helium in a balloon is 1.18 g/L. If a balloon holds 2.89 L of He, how many atoms of…

A: Since mass of He = density X volume  density of He = 1.18 g/L Volume of balloon = 2.89 L => mass…

Q: 2) Determine the mass of each sample: a) 1.32 mol carbon tetrafluoride b) 0.555 mol magnesium…

A:

Q: Determine the number of atoms in 39.0 grams of sodium, Na

A: Molar mass = mass of 1 mole 1 mole = 6.022 x 1023 entities

Q: 17) If 4.61 x 1021 atoms of element X have a mass of 0.815 g what is the identity of X? The…

A:

Q: Find the mass of 4.5 moles of Zinc (Zn).

A: Given, moles of Zinc (Zn) = 4.5 moles mass of Zinc (Zn) = ? g Note: molar mass of Zinc (Zn) = 65.38…

Q: Determine the number of atoms in 39.0 grams of calcium, Ca. (The mass of one mole of calcium is…

A: Mass of calcium = 39.0 grams Mass of 1 mol of calcium = 40.08 g. Number of atoms = ?

Q: What is the mass of 3.80 moles of waterThe atomic mass of Hydrogen is 1.00 amu and that of Oxygen is…

A: First we need to calculate mass of 1 mole of water using the given atomic mass units.  Then we can…

Q: The density of helium in a balloon is 1.18 g/L. If a balloon holds 2.91 L of He, how many atoms of…

A: Calculation of mass of Helium: Mass=Volume×density=2.91 L×1.18 g/L=3.4338 g Calculation of no. of…

Q: The density of helium in a balloon is 1.18 g/L. If a balloon holds 2.95 L of He, how many atoms of…

A: It is given that :Density of helium in a balloon = 1.18 g/LVolume = 2.95 L

Q: An unknown element X has the following isotopes: 140X (89.00% abundant) and 142X(11.00% abundant).…

A: Since,         Average Atomic mass=Σass of Isotope×% of Isotope100

Q: The density of helium in a balloon is 1.18 g/L. If a balloon holds 2.93 L of He, how many atoms of…

A: The mass of the species can be defined as the product of the density of the species and the volume…

Q: An unknown element X has the following isotopes: ¹⁴⁰X (89.00% abundant) and ¹⁴²X(11.00% abundant).…

A:

Q: How many atoms are there in 2 moles of Calcium

A: Number of moles of calcium = 2 moles  Number of atoms of calcium = ?

Q: How many atoms of Helium can a balloon that has a 25 cm diameter hold? The density of Helium is 1.18…

A: The mole (abbreviated mol) is the SI measure of quantity of a “chemical entity,” such as atoms,…

Q: Which sample contains the greatest number of atoms? O 102 g Ag O 189 g Ir O 18 g O O 53 g Fe

A: The number of moles is defined as the ratio of a given mass to molar mass. No. of moles =Given…

Q: the element rhenium re has two naturally occurring isotopes 185re and 187re and an average atomic…

A: Mass of sample = 770.0 gMass of Re-187 = 186.956 amuMass of Re-185 = 184.953 amu

Q: 2. How many grams are found in a sample of ammonia, NH3 that has 4.59 x 10²5 molecules? A) 4.71 x…

A: The question is based on mole concept. we need to calculate mass of given quantity of ammonia.

Q: Calculate the mass of CBr4 a) 320 g b) 332 g c) 92 g d) none of these

A: Mass of C = 12g/mol  Mass of Br = 80g/mol

Q: An unknown compound contains 53.34% rhodium, 9.338% carbon, and the rest is oxygen. a) If you assume…

A: Given a compound with the composition: Rh = 53.34 % C = 9.338 % O = 100 - (53.34 + 9.338) % = 37.322…

Q: A sample of a compound is found to contain 6.17 g carbon, 1.04 g hydrogen and 18.16 g chlorine. Its…

A:

Q: Determine the number of atoms of C in 38.2 grams of C12 H22 O11.

A: Weight of C12H22O11 = 38.2 gram Mole is equal to weight of substance divide by it's molar mass

Q: in a 63.17 gram sample of sulfur trioxide, how much of it is sulfur?

A: SO3 is an acidic oxide.

Q: Popol learns in his biology class that human body is approximately 9.5% carbon. How many moles of…

A: Given 9.5% mass percentage. Using this wa can calculate mass of carbon and then moles.  Further…

Q: In 6.9 g of aluminum, there are ______ x 1023 aluminum atoms present

A: Molecular mass of atom contains 6.023 × 10^23 atoms. Molar mass of aluminium is 26.981 g/mol

Q: Glucose is a carbohydrate that contains carbon,hydrogen,and oxygen .The empirical formula of glucose…

A: Since we know that empirical formula  is the simplest positive integer ratio of atoms present in a…

Q: What is the mass of a sample containing 1.00 mol of atoms, 33% of them N and 67% of them O?…

A:

Q: convert 1.89 • 1024 atoms of carbon to moles of carbon

A: Calculation of moles of Carbon :

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

A: Recall the formula of the unknown compound is C2Fx Given that the unknown compound contains 6.7 mol…

Q: Which of the following has the largest moles of oxygen per mole of the molecule?

A: 1 mole of any substance = avogadro number of particles                                          =…

Q: how many grams are in 4.46 x 10 24 atoms of carbon?

A: Number of carbon atoms present = 4.46 x 1024 Atomic mass of carbon is 12 grams Atomic mass means the…

Q: 320 g of a certain chemical element contains 4.82 x 1024 atoms. Find the name of the element. MAr…

A: Given 320 g of a certain chemical element contains 4.82 x 1024 atoms

Q: You have a 20.0 g sample of silver metal. You are given 10.0 g of another metal and told that this…

A: The situation is possible or not has to be determined.

Q: You analyze a 42.6582 g sample of a compound comprised of 5.2279 g of carbon, 20.8914 g of oxygen…

A:

Q: What mass (in grams) of CH„O contains 3.984 x 1025 atoms?

A: The ratio of given mass of substance to molar mass of that substance is called as number of moles.…

Q: a) how many moles of Na3PO4 are in a sample with a mass of 80.11 g? b) how many atoms of oxygen are…

A: a) given, mass of Na3PO4 = 80.11 g moles of Na3PO4 = ?  Note:  molar mass of Na3PO4 = 163.94 g/mol

Q: A compound is 24.7% calcium 1.2% hydrogen 14.7 carbon and 59.3% oxygen. Determine the chemical…

A: