Calculate the percentage by mass of N in (NH $_{4}$ ) $_{2}$ SO $_{4}$ . (H = 1, C = 12, N = 14, O = 16, Mg = 24, S = 32, Cl = 35.5, Al = 27, Ca = 40, Fe = 56, Cu = 63.5, Na = 23)

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Find the relative formula mass of NH $_{3}$ . (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, F…
Find the relative formula mass of MgCl $_{2}$ . (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40…
Find the relative formula mass of CuSO $_{4}$ . (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40…
Find the relative formula mass of Ca(NO $_{3}$ ) $_{2}$ . (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39…
Find the relative formula mass of Fe(OH) $_{3}$ . (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 4…
Find the relative formula mass of AgNO $_{3}$ . (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40…