Multiple Choice
A 1.4 g sample of calcium is reacted with 3.2 g of oxygen.The only product after the reaction is 1.96 g of CaO.How many grams of oxygen remains unreacted?
A) 0.56 g
B) 0.224 g
C) 2.64 g
D) 0.264 g
E) 0.203 g
Correct Answer:

Verified
Correct Answer:
Verified
Q108: With mass spectral data the ratio of
Q109: An isotope with mass number 81 has
Q110: Beta particles:<br>A)have a mass of 4 and
Q111: A new element is discovered.It has two
Q112: When decomposed chemically,73.0 grams of a sample
Q114: What mass of magnesium is necessary to
Q115: How many electrons are in the ion
Q116: An atom of <sup>131</sup>I contains _ neutrons.<br>A)53<br>B)184<br>C)78<br>D)124<br>E)131
Q117: A lead cube that is 3.00 cm
Q118: Which of the following is a metalloid?<br>A)mercury<br>B)selenium<br>C)bismuth<br>D)radium<br>E)calcium