How many kilograms of nh3 are needed to produce 1.90x10^5 of (nh4)2so4? answer in scientific notation

Molar mass :

NH₃ = 17.0 g/mol

(NH₄)₂SO₄ = 132 g/mol

2 NH₃ + H₂SO₄ = (NH₄)₂SO₄

2 x 17 g NH₃ 132 g  (NH₄)₂SO₄
( mass NH₃) 1.90 x 10⁵  (NH₄)₂SO₄

( mass NH₃) = (1.90 x 10⁵) x 2 x 17 / 132

( mass NH₃) = 6460000 / 132

( mass NH₃) = 48939.39 g

in kg :

48939.39 / 1000 = 48.93 kg = 4.893 x 10¹ kg

hope this helps!