help please Determine the oxidation state of P in HPO_4^2. +3 +5 +2 0 -3 Determi

Question

help please Determine the oxidation state of P in HPO_4^2. +3 +5 +2 0 -3 Determine the oxidation state of N in KNO_3. -4 +2 +4 +6 +5 Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s) + O_2 (g) right arrow 21MgO(s) when 8.00g of magnesium burns, the theoretical yield of magnesium oxide is _______g. 4.00 6.63 0.165 3.32 13.3 How many milliliters of an 8.0 M H_2 SO_4 solution are needed to make 0.35 L of a 3.5 M solution? 0.15 mL 9.80 mL 140 mL 980 mL 153 mL Calculate the wavelength (in m) of the blue light emitted by a mercury lamp with a frequency of 6.185 times 10^14 Hz. 2.29 times 10^-7 m 4.85 times 10^-7 m 2.07 times 10^-7 m 4.36 times 10^-7 m 6.75 times 10^-7 m calculate the frequency of the green light emitted by a hydrogen atom with a wavelength of 4.373 times 10^-7 m. 1.46 times 10^14 s-1 1.46 times 10^14 s^-1 6.86 times 10^14 s^-1 4.33 times 10^14 s^-1 6.17 times 10^14 s^-1 1.62 times 10^14 s^-1 Calculate the wavelength of a baseball (m = 155 g) moving at 35 m/s. 7.60 times 10^-36 m 2.15 times 10^-34 m 1.32 times 10^-37 m 1.22 times 10^-34 m 3.57 times 10^-32 m

Explanation / Answer

63) 1+X+4(-2) = -2

X = +5 (B)

64) 1+X+3(-2) = 0

X= +5 (E)

65) 48 g Mg(s) ----- 80 g MgO

8 g Mg(s) --------X

X = (80 x 8)/48 = 13.33 g MgO (E)

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