The number of molecules in one mole of a substance A) Depends on the molecular weight...
A mole of a substance has the same mass in grams as one unit (atom or molecules) has in atomic mass units. True False
General Chemistry Workshop 9: The Mole The mole is the unit of measurement for an amount in chemistry and physics. It is defined as the amount of sample that contains as many items as there are atoms in 12 grams of carbon 12 ( isotope). The number of items in 1 mole is called the Avogadro's number NA - 6.022141 x 100 1/mol Mole in science, just like a dozen in our everyday life, allows us to quickly count or...
General Chemisto Workshop 9: The Mole The mole is the unit of measurement for an amount in chemistry and physics. It is defined as the amount of sample that contains as many items as there are atoms in 12 grams of carbon-12 ( Isotope). The number of items in 1 mole is called the Avogadro's number NA 6.022141 x 1023 1 le t o Mole in science, just like a dozen in our everyday life, allows us to quickly count...
TB3 Liquid nitrogen is much cheaper than liquid helium. The molecular weight of diatomic nitrogen (N2) is about 28 g/mole and that of atomic helium is about 4 g/mole. One reason for this is that while nitrogen is the most common constituent of the atmosphere, only minute amounts of helium are found in the atmosphere. (Helium is found in natural gas deposits.) Why are only minute amounts of helium found in the atmosphere? TB3 If the absolute temperature of a...
For a substance crossing a cell membrane, the chemical driving force Select one: a. depends only on the concentration gradient if the substance is uncharged, but also depends on the electrical force if the substance is an ion. b. is the force that pushes molecules across the membrane, but only if the substance is actively transported. c. depends only on the concentration gradient, regardless of whether or not the substance is an ion d. is the total driving force on...
Molecular weight data for some polymer are tabulated. Determine: a) The number-average molecular weight b) The weight-average molecular weight c) What is the number-average degree of polymerization for this polymer? d) What is the weight-average degree of polymerization for this polymer? Side note: Please consider the monomer C3H6 Molecular weight data for some polymer are tabulated. Determine: The number-average molecular weight The weight-average molecular weight What is the number-average degree of polymerization for this polymer? What is the weight-average degree...
Density of water = 998 kg/m^3 Molecular weight of CaCO3 = 100 g/mole please help to solve this problem Determine the concentration, molarity, normality, and mole fraction of a 2-L solution containing 50 g calcium carbonate (CaCO3). Assume that the density of water is based on a temperature of 20°C/68°F.
The molecular weight of helium is 4.00 g/mole and its viscosity at 20 o C is 1.96×10-5 Pa-s. Calculate the following properties of helium at temperature of 20 o C and pressure of 0.01 atmosphere: a) Density; b) Mean thermal speed; c) Mean free path; d) Collision frequency
The molecular weight of helium is 4.00 g/mole and its viscosity at 20 o C is 1.96×10-5 Pa-s. Calculate the following properties of helium at temperature of 20 o C and pressure of 0.01 atmosphere: a) Density; b) Mean thermal speed; c) Mean free path; d) Collision frequency
Answer these questions about the substance given by the formula CBr₄: a.) Classify the substance: is it an element, a compound, a homogenous mixture, or a heterogeneous mixture? b.) If the substance is an element, is it a metal, nonmetal, or a metalloid? c.) If the substance is a compound, is it an ionic compound or a molecular compound? d.) What is the name of the substance? e.) What is the mass of a mole of the substance? f.) In...