Hydrobromic acid dissolves solid iron to form aqueous iron(II) bromide and hydrogen gas. What mass of hydrogen gas (in grams) will be produced upon dissolving a 4.60 g iron bar on a padlock to get it open?

Evaluate this exponential expression,8. (2 + 3)2 – 42

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2