Answer:
Because scientists call vaccines reagents.
To do a balancing to result to a balanced equation, we do elemental balance from each side of the equation. Hence we do separate balances for H, P, O and Ca. In this case, the final balanced equation after balancing elementally is <span>3 Ca(OH)2(aq) + 2 H3Po4(aq) = 6 H2O(l) + Ca3(Po4)2(s)</span>
Answer:
answer of first question is <u>Chlorine</u>
answer of second question is <u>Group </u><u>1</u><u>4</u>
<h3>
<u>PLEASE</u><u> MARK</u><u> ME</u><u> BRAINLIEST</u></h3>
The hydrogen bonding tendency of water causes it to be 'sticky,' in that water molecules tend to stick together (as in a puddle). This is known ascohesion. Because of this property, water has a high surface tension. This means that it takes a little extra force to break the surface of the water puddle.Mar 13, 2018
Mole fraction is the ratio of the constituent moles to the total constituents. The mole fraction of sodium chloride is 0.0443.
<h3>What is a mole fraction?</h3>
A mole fraction is the proportion of the moles of the component in a total component present.
In 100 gm of solution 13.0 5 means, there is 13.0 gm of sodium chloride present. The mass of water is calculated as,
100 - 13.0 = 87.0 gm
Moles of sodium chloride is calculated as:
![\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{13}{58}\\\\&= 0.224 \;\rm moles\end{aligned}](https://tex.z-dn.net/?f=%5Cbegin%7Baligned%7D%20%5Crm%20moles%20%26%3D%20%5Crm%20%5Cdfrac%7Bmass%7D%7Bmolar%5C%3B%20mass%7D%20%5C%5C%5C%5C%26%3D%20%5Cdfrac%7B13%7D%7B58%7D%5C%5C%5C%5C%26%3D%200.224%20%5C%3B%5Crm%20moles%5Cend%7Baligned%7D)
Moles of water are calculated as:
![\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{87}{18}\\\\&= 4.83\;\rm moles\end{aligned}](https://tex.z-dn.net/?f=%5Cbegin%7Baligned%7D%20%5Crm%20moles%20%26%3D%20%5Crm%20%5Cdfrac%7Bmass%7D%7Bmolar%5C%3B%20mass%7D%20%5C%5C%5C%5C%26%3D%20%5Cdfrac%7B87%7D%7B18%7D%5C%5C%5C%5C%26%3D%204.83%5C%3B%5Crm%20moles%5Cend%7Baligned%7D)
Now, moles fraction is calculated by dividing moles of sodium chloride by total moles as,
![\begin{aligned} \text{Mole fraction of NaCl} &= \dfrac{0.224}{0.224 + 4.83}\\\\&= 0.0443\end{aligned}](https://tex.z-dn.net/?f=%5Cbegin%7Baligned%7D%20%5Ctext%7BMole%20fraction%20of%20NaCl%7D%20%26%3D%20%5Cdfrac%7B0.224%7D%7B0.224%20%2B%204.83%7D%5C%5C%5C%5C%26%3D%200.0443%5Cend%7Baligned%7D)
Therefore, the mole fraction of sodium chloride is 0.0443.
Learn more about mole fraction here:
brainly.com/question/8076655
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