One mole of gas of He contains a Avagadro number of helium atoms. Each He atom contains 2 electrons.
Charge Calculate the total negative charge contained in one mole (6.0 x 1023 atoms) of helium....
1. One mole of sodium atoms contains: a) 23 atoms b) 6.022 x 1023 grams c) 6.022 x 1023 atoms d) 60.22 x 1023 atoms
Calculate the number of moles equivalent to 5.4 x 1023 atoms of helium. Note: Be sure to use the correct number of significant figures. 0 Respond with the correct number of significant figures in scientific notation (Use Enotation and only 1 digit before decimaleg 2.55 for 2.5 x 107 Numeric Answer:
One mole of gallium (6 × 1023 atoms) has a mass of 70 grams, as shown in the periodic table on the inside front cover of the textbook. The density of gallium is 5.9 grams/cm3. What is the approximate diameter of a gallium atom (length of a bond) in a solid block of the material? Make the simplifying assumption that the atoms are arranged in a "cubic" array, as shown in the figure. Remember to convert to SI units.
A helium atom contains two protons, two neutrons, and two electrons, and it is electrically neutral. Each proton contains two up quarks and one down quark, and each neutron contains two down quarks and one up quark. Electrons have a charge of -e, up quarks have a charge of +2e/3, and down quarks have a charge of -1e/3. (a) How much positive charge is contained in the nucleus? с (b) How much negative charge is contained in the nucleus (absolute...
What is the total negative charge, in coulombs, of all the electrons in a small 1.05g sphere of carbon? One mole of C is 12.0g , and each atom contains 6 protons and 6 electrons. Q = ?5.06
How many carbon atoms are in 8.44 mL of C3H6O? 1 mole = 6.02 x 1023 atoms 1 mL = 0.898 g The answer has to be in the correct significant figures. Not sure how to do this.
One gram of copper has 9.48 ✕ 1021 atoms, and each copper atom has 29 electrons. (a) How many electrons are contained in 0.80 g of copper? electrons (b) What is the total charge of these electrons? C
When two atoms of hydrogen are fused to make one atom of helium the total energy evolved is 3.83 x 10 12 kg m/s2. What is the total change in mass (kg) for this reaction? a) 4.26 x 10-29 b) 1.28 x 10-17 c) 3.45 x 108 d) 1.15 a b с d
2. If water has 10 electrons per atom (1 from each hydrogen, 8 from the oxygen), there are 18 g of water per mole and Avogadro's number (6.022 x 1023) of atoms per mole, how many grams of water do you need to have one Coulomb of charge from electrons?
One mole of titanium (6 1023 atoms) has a mass of 48 grams, and its density is 4.54 grams per cubic centimeter, so the center-to-center distance between atoms is 2.60 10-10 m. You have a long thin bar of titanium, 3.0 m long, with a square cross section, 0.15 cm on a side. You hang the rod vertically and attach a 142 kg mass to the bottom, and you observe that the bar becomes 1.55 cm longer. From these measurements,...