Answer:
b) Ammonia (NH3) and methane (CH4) because they contain hydrogen but do not dissociate to form hydrogen ions.
Explanation:
A substance will be classified as a base according to Arrhenius theory if it produces OH (-) hydroxide ions in water. Ammonia (NH3) is a basic substance, but it is not an Arrhenius base because it does not release hydroxide ions into solution, the same happens with methane (CH4), where all four hydrogens are bound very tightly to the carbon and are not going anywhere.
Number of neutrons = mass number - atomic number
= 99-29 = 70
Avagadros number states that 1 mol of any substance is made of 6.022 x 10²³ units.
1 mol of Cu is made of 6.022 x 10²³ atoms of Cu.
the molar mass of Cu is - 63.5 g/mol
63.5 g of Cu is made of 6.022 x 10²³ atoms of Cu
therefore 127.08 g of Cu contains - 6.022 x 10²³ atoms / 63.5 x 127.08
number of Cu atoms - 1.20 x 10²⁴ atoms of Cu
answer is 1) 1.20 x 10²⁴ atoms
Answer:
1. 11g
2. 909
Explanation:
To get the Weight of a 109 washers who weigh 0.110g each we have to find the ratio of Weight of one washer to 1 washer and multiply by 100
= 100 washers x 0.110g/1 washer
= 11g
Therefore the mass of 100 washers is 11 grams
2.
Then the number of washers =
100g x 1washer/0.110g
= 909
Therefore number of washers = 909
