the answer is A ...but i need to know how to work the problem 16) _...
D Question 3 0.5 pts If the pressure of a given sample of He gas is 1.57 atm at 18°C and the volume is 0.5 L, how many He atoms will be present? 2.0 x 1022 6.7 x 1022 0.033 2.0 x 1023 0.024
How many atoms of copper are in 2.50 mol Cu metal? Group of answer choices I 1.51 x 1023 atoms 2.41 x 1024 atoms 1.51 x 1022 atoms 1.51 x 1024 atoms 2.41 x 102 atoms
Question 16 Which of the following does NOT contain the same number of atoms as 3.30 moles of K? Not yet answered Marked out of 100 P Flag question Select one: A. 3.30 moles of Os B.3.30 moles of C. 1.50 moles of Ht D. 3.30 moles of Au O E. 3.30 moles of Co Question 17 How many molecules of Ny are in a 200.0 mL container at 780 mm Hg and 135°C? Not yet answered Marked out of...
Please show all steps and explain, as I need to understand for an exam. Thx! 16. A drop of water has a volume of 50 uL. How many water molecules does it contain? The density of water is 1.0 g/mL. A. 1.67 x 1021 molecules. B. 1.67 x 1018 molecules. C. 1.67 x 1020 molecules. D. 1.67 x 1023 molecules. E. none of the above. ANSWER: A
Question 16 (0.5 points) ✓ Saved How many hydrogen atoms are present in 0.829 g of Mg(H2PO4)2.2H2O? molar mass of Mg(H2PO4)2 .2H2O 20 = 254.32 g/mole OA) 8.00 B) 1.57 x 1022 • C) 7.10 X 1022 D) 1.80 x 1025
I need help solving these. I need to know the steps and calculations. 1. (1 pt) How many moles of K2S are 2.70 g K,S? 2. (1 pt) What is the mass of 4.26 g of K2S? 3. (1 pt) How many atoms of Cu are in 7.1 moles of Cu? 4. (1 pt) How many moles of C are in 5.80 x 10atoms of C? 5. (2 pts) How many atoms of Fe are in 81.4 g Fe? 6....
Need answers 13-16 QUESTION 13 1 points Save For a set amount of gas at constant pressure, T1 = 35.9° C becomes T2 = 157.3°C With V1 = 87.2 ml, what is V2? O a. 121 mL 6.62.6 mL O C. 1.051 O d. 382 L QUESTION 14 1 points Save A What is the density of O2 gas at 37.0°C and 2.30 atm? a. 1.83 g/L 6.270.g/L O C 0.0195 g/l od. 2.89 g/L QUESTION 15 1 points Save...
plz answer all questions all questions correctly in pen in the esamination booklet (10 pts cack) Hs pressure are present in a sample which occupies 450 ml at 32C, 720 mm 2) W hat is molar the molar mass ofagas with a density of 6.29 g/L at 1 atm, 25°C mixture of 14.2 g He and 36.7 g Ar, is placed in a 100 mL container at 290 a) what is the total pressure of the system? b) what is...
I just need 16-22 explained. 15) How many asymmetric carbons are present in the compound below? ttjus of atoms or greups of Atoms нон-с но Но- ОН Он 16) How many asymmetric carbons are present in the compound below? CO2H Н- OH н- OH CO2H 17) How many asymmetric carbons are present in the compound below? 3-ethyl-2,2,4-trimethylpentane 18) Can the molecule shown below be properly described as a meso compound? 19) Can the molecule shown below be properly described as...
8. i) How many moles of Neon gas will occupy a container with a volume of 2.5 L at a temperature of 31.5°C and a pressure of 912 torr? ii) What is the density of the gas? 9. A tank of compressed mixed gases contains 0.40 moles of Hz (hydrogen), 1.3 moles of NO2 (nitrogen dioxide), and 0.80 moles of Ar (argon). The total pressure in the tank is 2.8 atm. What is the partial pressure of the Hz gas?...