19) A 0.079 g sample of an unknown metal is dropped into hydrochloric acid and reacts to produce 66.0 mL of hydrogen gas at 22°C and 750 mm Hg. The vapor pressure of water at this temperature

is 18 mmHg. What is the unknown metal (X)?

2 X(s) + 6 HCl(aq) → 2 XCl3(aq) + 3 H2(g)

A) SC

B) Co

C) Fe

D) Al

E) Ga

Zu

Hai

Segment ab is shown on the graph. which shows how to find the x-coordinate of the point that will divide ab into a 2: 3 ratio using the formula

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?

Need now max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.