To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and
water.
4Au(s) + 8NaCN(aq) + O2(g) + 2H2O(1) ►
4NaAu(CN)2(aq) + 4NaOH(aq)
a. Determine the mass of gold that can be extracted if
25.0 g sodium cyanide is used.
b. If the mass of the ore from which the gold was
extracted is 150.0 g, what percentage of the ore is
gold?

What happens to isotopes that are unstable?

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?