Question

(a) What is the mass of nitrogen present in the sample of sodium nitrate (NaNO3) which contains 100g of sodium?
(b) What is the mass of water of crystallization present in the sample of sodium carbonate-10-water (Ma2CO3·10H2O) which contains 4.6g of sodium?
(c) A metal oxide MO contains 79.87% by mass of the metal M. Find the relative atomic mass of M.
(d) 26.88g of a metal chloride MCl contains 5.68 g of chlorine. Find the relative atomic mass of the metal M.

Answer 1

@gerryliyana

Answer 2

(Ar Nitrogen/Mr NaNo3) x mass of NaNO3

Answer 3

Ar stands for what?

Answer 4

mass of relative atom

Answer 5

Mr is "mass of relative molecule"

Answer 6

ok

Answer 7

no need to times 100g?

Answer 8

do you have a periodic table?

Answer 9

yes

Answer 10

wait a moment

Answer 11

\[\large m \text { N}=100g \text { Na} \times \frac{ 14g \text{ N} }{ 23g \text { Na} } \approx 61g \text { N}\]

Answer 12

Na=23.0g
N=14.0g
O=16.0g

Answer 13

why 23g Na?? not NaNO3?

Answer 14

but my idea is this...