How many moles of silver (Ag) are there in 5.0 g of AgNO_3? (AgNO_3 = 170 g/mol)

Question

How many moles of silver (Ag) are there in 5.0 g of AgNO_3? (AgNO_3 = 170 g/mol) Which of following are the correct ions in (NH_4)_2 SO_4 ? What is the ground-state electron configuration for Mg^2+? Which of the following could be an empirical formula? N_2 O_4 N_2 C_6 H_12 what is the energy, in joules, of a photon with frequency 3.22 Times 10^14 Hz? Which reaction below represents the second ionization of Sr? "No two electrons in an atom can have the same four quantum numbers" is known as the What is the molarity of F^- in a 250 mL solution containing 18.34 g LiF and 4.32 g NaF. Which of the following electron transitions will produce a photon of the longest wavelength in the Bohr hydrogen atom ? A triple covalent bond contains of electrons.

Explanation / Answer

I will resolve from 25 to 28, 4 questions in total, I will gladly answer more but please post them in another question:

25.

170 g of AgNO3 ------------- 1 mol

5.0 g of AgNO3-------------- x mol    x= 5.0 x 1 /170= 0.029 moles option b as there is one Ag for every AgNO3

26.

(NH4)2SO4 is the compound from ion sulfate: SO4-2 and ion ammonium NH4+1, Option C

27. Mg ground state has to be as follows:

But as it is ionized with +2 it lose 2 electron from the outer layer staying as:

1s2 2s2 2p6 OPTION D

28.

the empirical formula of a chemical compound is the simplest positive integer ratio of atoms present in a compound, analyzing your answers it can only be C6H5Br OPTION E

BONUS QUESTION AS I´M KIND: 34. 1 bond needs always 1 pair or electrons so a triple bond needs 3 pairs, option D

1s2 2s2 2p6 3s2,

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