Ca, Sr, Ba have similar chemical properties.
Explanation: They are in the same group (Alkaline Earth Metals)
The answers is A-Farmers will increase their use of chemicals that kill pests
Answer:
6.32cm^3
Explanation:
Step 1:
Data obtained from the question include:
Mass of boron = 14.8g
Density of boron = 2.34 g/cm^3
Step 2:
Determination of the volume of boron. This is illustrated below:
Density = Mass/volume
2.34 g/cm^3 = 14.8g/volume
Cross multiply to express in linear form
2.34 g/cm^3 x Volume = 14.8g
Divide both side by 2.34 g/cm^3
Volume = 14.8g/ 2.34 g/cm^3
Volume = 6.32cm^3
In order to find the mass (in grams) of an element, you just need to multiply the no. of moles given by the atomic mass of the element, which can be found in a periodic table.
mass of 15.0 moles of N= 15.0 x 14.0 = 210g
mass of 5.0 moles of Zn= 5.0 x 65.4 = 327g
mass of 20.0 moles of H= 20.0 x 1.0 = 20g
mass of 1.0 moles of Pb= 1.0 x 207.2 = 207.2g
Therefore, since 327g is the greatest mass out of the 4 options, the answer is 5.0 moles of Zn.
