Calculate the mass of 23.7 mol of helium.
a. 2.6.02 x 1023 g
b. 94.9 g
c. 27.7g
d.5.92 g
e 1.43 x 1025 g
2. Which of these quantities does not represent 1.00 mol of the indicated substance? a. 6.02 x 1023 C atoms b. 55.85 g Fe c. 12.01 g C d. 15.4 g Zn e. 6.02 x 1023 Fe atoms 3. If 0.274 moles of a substance weighs 6.66 g, what is the molar mass of the substance, in units g/mol? a. 2.28 x 102 g/mol b. 1.71 x 10 g/mol c. 4.38 x 103 g/mol d. 2.17 x 10 g/mol e....
(c) Helium has molar mass 4x 10-3 kg mol-1. Find the total mass of N 1025 helium molecules.
If the molar mass of helium is 4.0 g/mol4.0 g/mol and the molar mass of neon is 20.2 g/mol20.2 g/mol, then... a) All the atoms have exactly the same velocity. b) All the atoms have the same average speed. c) The average speed of the helium atoms is greater than the average speed of the neon atoms. d) The average speed of the neon atoms is greater than the average speed of the helium atoms. e) The atoms diffuse from...
3) Calculate the percentage by mass of hydrogen in PtCl2(NH3)2 A) 0.672 B) 2.016 C) 1.008 D) 0.034 E) 1.558 4) How many molecules of CH4 are in 48.2 g of this compound? A) 1.81 x 1024 B) 4.00 C) 2.00 x 1023 D) 4.64 x 1026 E) 5.00 x 10-24 5) A sample of CH2F2 with a mass of 19 g contains A) 9.5 B) 3.3 * 1024 C) 2.2 x 1023 atoms of F. D) 4.4 x 1023...
The molecular mass of helium is 4 g/mol, the Boltzmann’s constant is 1.38066 × 10−23 J/K, the universal gas constant is 8.31451 J/K · mol, and Avogadro’s number is 6.02214 × 1023 1/mol. Given: 1 atm = 101300 Pa. How many atoms of helium gas are required to fill a balloon to diameter 26 cm at 14◦C and 1.696 atm? What is the average kinetic energy of each helium atom? Answer in units of J. What is the RMS speed...
Qustion Campleon Status: QUESTION 7 What is the mass of a 4.110-mol sample of sodium hydroxide? Oa. 98.6 g Ob0.1028 g Oc 164,4 g O d.9.732 g Oe. 40.00 g QUESTION 8 A sample of ammonia has a mass of 89.9 g. How many molecules are in this sample? Oa541 x 1025 molecules Ob.5.28 molecules Oc3.18x 1024 molecules Od 1.14 x 1023 molecules x 10-15, molecules QUESTION 9 A mole of a chemical substance represents Oa.6.02 x 1025 chemical particles...
49. Calculate the mass of water produced when 625 of methane, CH4, reacts with an excess of oxygen in the following unbalanced reaction. CH4%)+18) + CO2g)+H2Og) a. 7.02 g H20 b. 2.25 x 10² g H20 c. 14.0 g H20 d. 0.347 g H20 c. 0.78 g H20 50. In the reaction below, how many molecules of hydrogen are required to react with 9.79 g of nitrogen? 3H,@) + N2) 2NH3) 1.2.10 x 1023 molecules hydrogen b. 3.16 x 1023...
#11-12 milk and Ar 4. A 010 (part 1 of 3) 10.0 points The molecular mass of helium is 4 g/mol, the Boltzmann's constant is 1.38066× How 10-23 J/K, the universal gas constant is ice c 8.31451 J/K mol, and Avogadro's number The s is 6.02214 x 1023 1/mol. Given: 1 atmspeci 101300 Pa. speci How many atoms of helium gas are required to fill a balloon to diameter 27 cm at 24 C and of va 1.879 atm? heat...
what is the predicted product from the following combination reaction? E) none of the above 33) Which of the following produces the characteristic color of a fireworks display? A) atoms exploding B) molecules exploding C) electrons dropping to lower energy levels D) nuclei dropping to lower energy levels E) none of the above Chapter 8 34) How many atoms of cobalt equal a mass of 58.93 g? (Refer to the Periodic Table.) A) 1 B) 27 C) 58.93 D) 59...
If 4.05 x 1023 molecules of a substance have a mass of 86.2 g, what is the molar mass of the substance? Multiple Choice 128 g/mol 3.49 1025 g/mol 0 2.13 * 1022 g/mol 4.70 * 1021 g/mol 58.0 g/mol