Cho 28 gam sắt tác dụng với lượng dung axit sunfuric (H2SO4) tạo muối sắt (II) sunfat và khí hiđro. a) Viết phương trình phản ứng xảy ra.

b) Tính khối lượng axit tham gia phản ứng.

c) Tính khối lượng muối thu được sau phản ứng.

d) Cho khí hiđro thu được ở trên qua CuO vừa đủ, nung nóng. Sau khi phản ứng xảy ra hoàn toàn thu được m gam kim loại. Tính m.

You are to give ampicillin with a recommended dose of 25mg/kg to a child with a mass of 29kg. if stock on hand is 250mg/capsule how many capsules should be given?

Which statement justifies that hydrogen peroxide (h2o2) is a polar molecule? the o – h bond is nonpolar and the molecule is asymmetric. the o – h bond is nonpolar and the molecule is symmetric. the o – h bond is polar and the molecule is asymmetric. the o – h bond is polar and the molecule is symmetric.

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.