Question

PLEASE HELP ME ANSWER THESE QUESTIONS!

1.) Calculate the number of moles (n) in 14.0 g of sodium hydroxide
(NaOH)

2.) Calculate the number of moles (n) in 0.05 g of sulfuric acid
(H2SO4)

3.) What is the mass of 4.75 moles of lead atoms

4.) What is the mass 0.04 mol of hydrochloric acid (HCl)

5.) How many atoms are there in 5.00 mol of silver

6.) How many atoms are there in 3 X 10 - 10 mol of copper

Answer 1

1. 0.35 moles NaOH

2.
`5.10x10^(-4)` moles
`H_2SO_4`

3. 505.4 g Pb

4. 1.46 g HCl (if that is wrong it's 1.5 g HCl due to sig figs)

5.
`3.01x10^(23)` atoms of Ag

6.
`2x10^(-10)` atoms of Cu

Step-by-step explanation:

1. The mass of NaOH is 40g. 22.99(Na)+16(O)+1.01(H)=40 g

14 g NaOH *
`(1 mol NaOH)/(40 g NaOH)` = 0.35 moles of NaOH

2. Mass of
`H_(2) SO_(4) = 2(1.01)+32.06+4(16) = 98.08`

0.05 g
`H_2SO_4` ×
`(1 mol H_2SO_4)/(98.08g H_2SO_4) = 5.10 x10^(-4)`

3. mass of Pb = 106.4 g

4.75 moles Pb×
`(106.4 g Pb)/(1 mol Pb) =505.4 g Pb`

4. mass of HCl = 1.01 +35.45 = 36.36 g

0.04 mol HCl x
`(36.46 g HCl)/(1 mol HCl) = 1.456 = 1.5`

5. 5.00 mol Ag x
`(6.022x10^(23) atoms )/(1mol Ag) = 3.01x10^(24) atoms`

6.
`3x10^(-10) moles` Cu x
`(6.022x10^(23) atoms)/(1 mol Cu) = 1.8668x10^(14)= 2x10^(14)` atoms of Cu