Answer:
4 is the answer
Explanation:
i am not sure for this question
Mole is equal to mass of the element divided by molar mass of the element. that is
mole=mass/molar mass
From periodic table calcium has a molar mass of 40 g/mol
moles is therefore =800g/40g/mol=20moles
Answer: The volume of 
required is 25.0 ml
Explanation:
According to the neutralization law,
where,
= basicity 
= 1
= molarity of solution = 2.00 M
= volume of solution = 50.0 ml
= acidity of = 1
= molarity of solution = 4.00 M
= volume of solution = ?
Putting in the values we get:
Therefore, volume of required is 25.0 ml
<span> The thermal </span>energy<span> is being </span>converted<span> to light </span>energy,<span> you are using electrical </span>energy<span>. </span>Your body<span> relies on the chemical </span><span>energy</span>
