(Solved): can you help me with these? Which statement best describes the polarity of the \( \mathrm{NH}_{3} \) ...

Which statement best describes the polarity of the \( \mathrm{NH}_{3} \) (ammonia) molecule? Ammonia is polar because the \( \mathrm{H}-\mathrm{N} \) bonds are polar and not symmetrically distributed around the central atom Ammonia is polar because its hydrogen atoms become \( \mathrm{H}^{+} \)ions and its nitrogen becomes the \( \mathrm{N}^{3-} \) ion Ammonia is nonpolar because the \( \mathrm{H}-\mathrm{N} \) bonds are nonpolar Ammonia is nonpolar because the lone pairs and bonding pairs of electrons are symmetrically distributed around the central atom Consider a sample of \( 1.0 \) mole of \( \mathrm{N}_{2} \) molecules and \( 1.0 \) mole of Mg atoms. Identify if each statement is true or false. Both samples contain the same number of atoms Both samples have the same mass in grams Both samples contain \( 6.022 \times 10^{23} \) atoms Both samples contain \( 6.022 \times 10^{23} \) particles (molecules or atoms) The sample of \( 1.0 \) mole of \( \mathrm{N}_{2} \) weighs more than the sample of \( 1.0 \) mole of \( \mathrm{Mg} \) How many hydrogen atoms are present in \( 2.0 \mathrm{~mol} \mathrm{Ca}(\mathrm{OH})_{2} \) ? Calculate your answer to the correct number of significant figures and enter your answer using scientific notation format. \( \times 10^{\wedge} \) hydrogen atoms