Answer:
A. It has a partial negative charge on oxygen and a partial positive charge on hydrogen.
Explanation:
There is an electronegativity difference between O and H atoms. The electronegativity value of O and H are 3.5 and 2.1 respectively. So the electronegativity different of the O-H bond is 3.5- 2.1 = 1.4 thus making the O-H bond polar. O being the more electronegative bond acquires a partial negative charge and H acquires a partial positive charge.
Atoms of metals tend to 2. Lose electrons and form positive ions.
<u>Answer:</u> The number of moles of ideal gas are 0.0037 moles
<u>Explanation:</u>
To calculate the mass of helium gas, we use the equation given by ideal gas:
PV = nRT
where,
P = Pressure of helium gas = 52 cmHg = 520 mm Hg (Conversion factor: 1 cm = 10 mm)
V = Volume of the helium gas = 137 mL = 0.137 L (Conversion factor: 1L = 1000 mL)
n = number of moles of gas = ?
R = Gas constant =
T = Temperature of helium gas = (Conversion factor: )
Putting values in above equation, we get:
Hence, the number of moles of gas is 0.0037 moles.