Nguyên tố X ở chu kỳ 4, phân nhóm VA. Nguyên tố Y cùng chu kỳ, cùng nhóm với X nhưng khác phân nhóm. Vậy Y ở:

Who is better, messi or cristiano, i need this for a chemistry class. asap

Given sno2 + 2h2 - sn + 2h20 tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?

Select the correct answer a modure consists of glucose and water. what is the percent composition of glucose in the mixture if it contains 1.3 moles of glucose (cho total mass of the mature is 276 grams? ) and the a 1775