Answer: The answer is D.
Explanation: The warm water will cause the sugar to dissolve quicker.
Answer:
water vapor
Explanation:
because gas molecules moves the fastest
Answer:
Temperate Grasslands
Explanation:
Tundras have nothing to do with grass. Tundras are more like ice
Answer: There are
atoms of hydrogen are present in 40g of urea,
.
Explanation:
Given: Mass of urea = 40 g
Number of moles is the mass of substance divided by its molar mass.
First, moles of urea (molar mass = 60 g/mol) are calculated as follows.
![Moles = \frac{mass}{molar mass}\\= \frac{40 g}{60 g/mol}\\= 0.67 mol](https://tex.z-dn.net/?f=Moles%20%3D%20%5Cfrac%7Bmass%7D%7Bmolar%20mass%7D%5C%5C%3D%20%5Cfrac%7B40%20g%7D%7B60%20g%2Fmol%7D%5C%5C%3D%200.67%20mol)
According to the mole concept, 1 mole of every substance contains
atoms.
So, the number of atoms present in 0.67 moles are as follows.
![0.67 mol \times 6.022 \times 10^{23} atoms/mol\\= 4.035 \times 10^{23} atoms](https://tex.z-dn.net/?f=0.67%20mol%20%5Ctimes%206.022%20%5Ctimes%2010%5E%7B23%7D%20atoms%2Fmol%5C%5C%3D%204.035%20%5Ctimes%2010%5E%7B23%7D%20atoms)
In a molecule of urea there are 4 hydrogen atoms. Hence, number of hydrogen atoms present in 40 g of urea is as follows.
![4 \times 4.035 \times 10^{23} atoms\\= 16.14 \times 10^{23} atoms](https://tex.z-dn.net/?f=4%20%5Ctimes%204.035%20%5Ctimes%2010%5E%7B23%7D%20atoms%5C%5C%3D%2016.14%20%5Ctimes%2010%5E%7B23%7D%20atoms)
Thus, we can conclude that there are
atoms of hydrogen are present in 40g of urea,
.
What do you need help on?