Which of the following pairs of atoms represent isotopes?
a. 14n, 14c
b. 12c, 14c
c. 77se, 19fe
d. 1h, 18o
e. 79br, 35cl

Explanation:

Isotopes are atoms of the same element that have the same number of protons (needless to say since they are from the same element) but they have different numbers of neutrons and hence masses.

These are two different atoms from the same element, carbon with the same number of protons but different number of neutrons hence the different relative atomic masses

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

answer: a tank of height h is filled with water and sits on the ground. water squirts from a hole at a height y above the ground and has a range r. for two y values, 0 and h, r is zero. determine the value of y for which the range will be a maximum.

explanation: