How many calcium atoms are in a 5.0 g sample of the metal? 7.5 times 10^-22 7.5
ID: 999533 • Letter: H
Question
How many calcium atoms are in a 5.0 g sample of the metal? 7.5 times 10^-22 7.5 times 10^22 7.5 times 10^24 7.5 times 10^-24 none of the How many of moles of potassium are in a 3.50 g sample of the metal? 112 mol 0.0895 mol 3.50 mol what is the mass of 0.075 mol of carbon dioxide? 1 -5 g 0.44 g 3.3 g 4.5 g none of these How many grams of Ca(OH)_2 are formed from exactly 5.00 g of CaO 13.2 g 6.61 g 5.1g 1.8g none of these What is the shape of the ammonia molecule and hybridization of the N; trigonal planar, sp^2 pyramidal, sp^3 T-shaped, dsp^2 trigonal bipyramidal. dsp^3 none of these What is the oxidation state of Cr in Cr_2O_72-? + 2 + 4 + 5 + 6 none of If 20.0 calories of heat are supplied to a 20.0 g sample of water at 25. what is the final temperature of the water? The specific heat of water is How much heat is evolved when a 10.0 g sample of carbon is burnt AH for the reaction C(s) + O_2(g) rightarrow CO_2(g) is -90.0 lJ/mol 90.0 kJ 900 kJ 75.0 kJ 41.8 kJExplanation / Answer
17. 40 gram of Calcium -----------> 6.023 x 10 23
5.0 gram of Calcium -------------> ?
=> 5 x 6.023 x 10 23/40 = > 7.5 x 10 22
18. 1 mole of potassium ---------> 39.09 grams of sample of metal
? <-----------------------3.50 grams of sample of metal
=> 3.50grams/39.09=> 0.0895 moles
19. 1 mole ------------> 44 grams of CO2
0.075 mole-----------> ?
=> 0.075 X 44 => 3.3 grams of CO2
20. CaO + H2O --------> Ca(OH)2
Based on the above example 56 grams of CaO -------------> 74 grams of Ca(OH)2
5 grams of CaO -----------> ?
=> 5 x 74 / 56 = 6.607 grams of Ca(OH)2
21. shape Trigonal bipyrimidal, dsp2
22. 2 (Cr) - 7 (-2) = -2
2Cr-14=-2
2Cr = -2 + 14 => Cr = + 6
23 & 24 Questions are not clear. to visible.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.