Unknown element X combines with oxygen to form the compound XO2. If 44.0 grams of element X combines with 8.00 grams of oxygen, what is the atomic mass of element X?

A. 16 amu

B. 44 amu

C. 88 amu

D. 176 amu

E. 352 amu

Juliana was late to physical science class and missed the beginning of the notes, including the title. these are the notes she took.

How are inner and outer planet differt?

3. Sodium carbonate (Na2CO3) is formed from the reaction between O A a weak acid and a strong base B a strong acid and a strong base C a strong acid and a weak base OD a weak acid and a weak base

How many moles of each element are in this sample p2o3

6. Given the following incomplete reaction: CaBr2 + 2Li → Ca + List the elements (including how many of each element) that would have to be present in the compound represented by the blank in order to demonstrate conservation of mass?

Identify the number of core and valence electrons for each atom. Xe : core electrons Xe : valence electrons Ca : core electrons Ca : valence electrons Br : core electrons Br : valence electrons

What do the lines around the finger of the doorknob represent?

Identify what type of reaction is below. Also determine what coefficients that would balance the chemical equation.

Much of life on Earth is based in aquatic biomes. What property of water allows life to survive in liquid water?

A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have? 13 9 5 4