Answer : The mass percent of in the sample is, 65.7 %
Explanation :
As we are given that Na makes up 18.00% of the entire mass of the sample.
First we have to calculate the mass percent of Na in .
Mass of Na = 23 g
Mass of = 84 g
Putting values in above equation, we get:
Now we have to calculate the mass percent of in the sample.
As, 27.4 % amount of Na present in 100 %
So, 18 % amount of Na present in
Therefore, the mass percent of in the sample is, 65.7 %
<span>In a galvanic cell made of aluminium electrode and sodium electrode ,sodium is the positive electrode and so oxidation occurs and ions go in to the solution.so sodium electrode is oxidised.And the other electrode is reduced and it accepts the ions .</span>
Given :
A chemical equation :
To Find :
What is the type of reaction :
A. Single replacement
B. Decomposition
C. Double replacement
Solution :
We know when a single compound turns into two or more compounds or element, this type of reaction is said to be decomposition reaction.
In the given equation decomposes into and .
Therefore, the given reaction is decomposition reaction.
Consider the equation for weight:
W=mg
W is the weight, m is the mass, and g is the acceleration due to gravity.
Therefore, to calculate the weight of an object, just multiply its mass by the acc. due to gravity of the location.
The acc. due to gravity on Earth is approximately 9.81 ms^-2, note that this number may change from place to place, for example, the acc. due to gravity on moon is only 1/6 of Earth's. (Sometimes the question provides g as 10, so make sure you check the instructions before!)
W = 1.5 x 9.81
= 14.715N (≈14.7N)
Therefore, the answer to this question is the last option (or D), 14.7N.
The charge on Calcium is +2. Since, Calcium oxide is a neutral compound, so the charge on Oxygen should be -2. <span>Valency of Oxygen is 2, so a single Oxygen atom can satisfy the need.
Therefore, formula is CaO.</span>