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

How many shells are occupied by electrons in the gold atom (au, atomic# 79) (hint: refer to the shell model of the atom) ?

Are specialists who apply information gathered from past scientific investigations to develop new technologies.

Give an example of a non abelian group g such that g/z (g) is abelian

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what property of PVC means it can not be used for bags?

A solution of a compound with a known extinction coefficient of 23,100 M-1cm-1 has an absorbance of 0.735 in a 1.30cm path length, what is the concentration of the solution

Balance the following equation with the smallest whole number coefficients. Choose the answer that is the sum of the coefficients in the balanced equation. Do not forget coefficients of "one". RbOH + H3PO4 → Rb3PO4 + H2O

What is the temperature of 100 liter container having 1 mole of an ideal gas at a pressure of 20 kilopascals

5.2*10^26 molecules of ch4 in volume

Which of the following statements about igneous rocks is correct A. intrusive igneous rocks are formed when magma is called above the ground. B. Extrusive igneous rocks are formed when magma is cooled above the ground C.