What mass (in g) does 0.990 moles of Kr have?
A. 83.0 g
B. 52.8 g
C. 240119 g
D. 240 g
E. 35.6 g
What mass (in g) does 0.990 moles of Kr have? A. 83.0 g B. 52.8 g...
As shown in the figure, a ball with a mass of 0.990 g and positive charge of q=40.8 μC is suspended on a string of negligible mass in a uniform electric field. We observe that the ball hangs at an angle of θ=23.0o from the vertical. What is the magnitude of the electric field? (in N/C) A: 5.712×101 B: 7.597×101 C: 1.010×102 D: 1.344×102 E: 1.787×102 F: 2.377×102 G: 3.162×102 H: 4.205×102
Calculate the amount, in moles, of (a) 647 g of Ba(OH2 (b) 16.3 g of sulfur trioxide, (c) 35.6 g of nickel(ID chloride heptahydrate, (d) 218 mg ethyl mercaptan, CH,CH2SH, and (e) 3.32 × 10" kg of iron(11) sulfide.
A 52.8 g ball of copper has a net charge of 2.7 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.) What is the charge on the sphere contributed by protons? How many total protons are there?
A.) 0.592 g are equivalent to 0.00481 moles. What is the molar mass? B.) Consider 0.606 g of a volatile liquid that as a gas occupies 137.4 mL at a pressure of 1.097 atm at 98.1 C. What is the mass of the volatile liquid?
A.S' B. Si C. AU D.Ag E. SI 25. Predict the charge that a calcium ion would have 1.6 B. 2 c.r D. 2* Er 26. Give the number of neutrons in P A. 18 B.12 C . 19 D. 15 E. 16 E. 144 g 27. What mass (in g) does 5.68 moles of Kr have? A. 334 g B. 476 g c.211g D. 240 g 28. How many moles are in 2.86 x 10" atoms of Zn? A....
If the gas has a molar mass of 86 g/mol, what is the density of a gas (in g/L) at 25.0°C and 124.1 kPa? Consider four identical 1.0-L flasks containing the following gases each at 25°C and 1 atm pressure. For which gas do the molecules have the greatest average kinetic energy? A. Ne B. Ar C. He D. Kr E. same for all the gases
What is the mass of one atom of copper in grams? A) 65.4 g B) 63.5 g C) 1.06 times 10^-22 g D) 52.0 g E) 58.9 g How many moles of O_2(g) are needed to react completely with 52.0 L of CH_4 (g) at STP to produce CO_2(g) and H_2(g) according to the following balanced equation: CH_4(g) + 2O_2 rightarrow CO_2(g) + 2H_2O(g) A) 4.64 B) 52.0 C) 11.6 D) 2.32 E) none of these Atoms with greatly differing...
An element has the following electronic configuration: [Kr]4d15s2 (a) What period does it belong to? (b) What is its group number? (Use group numbers from 1 to 18) (c) What kind of element is it? (Main group metal, transition metal, metalloid, nonmetal?) (d) How many unpaired electrons are there in an atom of this element? (e) What element has this electronic configuration? (attached figure) Thank you!!! :) 4p AS 3d
(a) How many moles of ammonium ions are in 0.777 g of ammonium carbonate? (b) What is the mass, in grams, of 0.0421 mol of iron(III) phosphate? (c) What is the mass, in grams, of 5.12 1023 molecules of aspirin, C9H8O4? (d) What is the molar mass of a particular compound if 0.070 mol weighs 6.46 g?
(a) How many moles of ammonium ions are in 0.345 g of ammonium carbonate? (b) What is the mass, in grams, of 0.0499 mol of iron(III) phosphate? (c) What is the mass, in grams, of 4.92 1023 molecules of aspirin, C9H8O4? (d) What is the molar mass of a particular compound if 0.088 mol weighs 5.44 g?