What is the approximate percent by mass of oxygen in C2H4O2

Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic

The enthalpy of fusion of methanol (CH3OH) is 3.16 kJ/mol. How much heat would be absorbed or released upon freezing 25.6 grams of methanol? 1. 2.52 kJ absorbed 2. 3.95 kJ absorbed 3. 0.253 kJ absorbed 4. 2.52 kJ released 5. 3.95 kJ released

All of the following are potential hazards in the environment except: A. lead B. asbestos C. pesticides D. lung cancer

If the pH value was 3.6, what is the [H+]? 2.5 x 10-4 4.0 x 103

What block does sodium belong to? s-block p-block d-block or f-block

What is the total value of a small digit in 94257

what is the density of a substance that has a mass of 2.0 g, and when placed in a graduated cylinder the volume rose from 70 mL to 75 mL

A block of lead has dimensions of 4.50cm by 5.20cm by 6.00 cm. The block weighs 1587 g. From this information, calculate the density of lead.

Which states of matter have no definite volume?

Which weighs more 10g of iron or 10g of water