The probability map for an electron is called A) an orbit B) an orbital C) an el

Question

The probability map for an electron is called A) an orbit B) an orbital C) an electron configuration D) a photon E) none of these How many moles of Ca atoms are in 801 g Ca? A) 4.99 times l0^-2 mol B) 40.0 mol C) 801 mol D) 20.0 mol E) 1.60 times 10^3 mol The number 0.000402 expressed in exponential notation is A) 4.02 times 10^4 B) 4.02 times 10^-2 4.02 times 10^-3 D) 4.02 times 10^-4 E) 4.02 times 10^3 A 5.10-g sample of iron is healed from 36.0 degree to 75.0 degree C. The amount of energy required is 89.5 J. The specific heat capacity of this sample of iron is A) 11.7 J/g degree C B) 17800 j/g degree C C) 0.900 J/g degree C D) 2.22 J/g degree C E) 0.450 J/g degree C Which element or ion listed below has the electron configuration ls^22s^22p^6 A) Al^3+ B) Ne C) Na^+ D) F^- E) all of these

Explanation / Answer

22) (A) an orbital

23) Number of moles,n= mass/molar mass

n= 801g/40(g/mol)

n=20.0 mol

So option (D) is correct.

24) 0.000402=4.02*10^-4

Therefore option (D) is correct.

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