Answer:
120g
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
Sn + 2HF —> SnF2 + H2
Next, we shall determine the number of mole of HF needed to react with 3 moles of Sn.
From the balanced equation above, 1 mole of Sn reacted with 2 moles of HF.
Therefore, 3 moles of Sn will react with = 3 x 2 = 6 moles of HF.
Finally, we shall convert 6moles of HF to grams
This is illustrated below:
Number of mole of HF = 6moles
Molar Mass of HF = 1 + 19 = 20g/mol
Mass of HF =..?
Mass = number of mole x molar Mass
Mass of HF = 6 x 20
Mass of HF = 120g
Therefore, 120g of HF is needed to react with 3 moles of Sn
C. released or absorbed.
When the energy is released the reaction is called exotermic reaction
When the energy is absorbed, the reaction is called endothermic reaction
An example of exotermic reaction is between water and H2SO4
Answer:
C. 2-methylpropane
Explanation:
There are rules guiding the naming of hydrocarbons. Some of the rules are:
1.) The longest continuous chain is the parent chain:
The longest chain here is made up of 3-carbon atoms which is a propane compound
2.)The carbon atoms are numbered in the parent chain to indicate where branching or substitution takes place.
Here, it is in the second carbon atom in propane.
The branched group is methyl- which is a methane molecule that has lost a hydrogen atom.
This makes ths name of the compound to be:
2-methylpropane
The first question would be 2, 47 sex cells
the second question would be 4, specific genes
the third question would be 4, 100%
