MathDB

9

Part of 2010 National Chemistry Olympiad

Problems(1)

2010 USNCO Local #9: Number of Neutrons

Source:

11/21/2012
How many neutrons are in 0.0250.025 mol of the isotope 2454Cr{ }_{24}^{54}\text{Cr}?
<spanclass=′latex−bold′>(A)</span>1.5×1022<spanclass=′latex−bold′>(B)</span>3.6×1023<spanclass=′latex−bold′>(C)</span>4.5×1023<spanclass=′latex−bold′>(D)</span>8.1×1023 <span class='latex-bold'>(A)</span>\hspace{.05in}1.5\times10^{22} \qquad<span class='latex-bold'>(B)</span>\hspace{.05in}3.6\times10^{23} \qquad<span class='latex-bold'>(C)</span>\hspace{.05in}4.5\times10^{23} \qquad<span class='latex-bold'>(D)</span>\hspace{.05in}8.1\times10^{23} \qquad