What is the mass of 2.90 L of O2 gas at STP

4.16 g

Explanation:

Volume,  V = 2.90 L

STP mans standard temperature and pressure

T = 273 K

P = 1 atm

Mass = ?

Using the ideal gas equation;

PV = nRT

where R = General gas constant = 0.082 L atm mol-1 K-1

n = PV / RT

n = 1 * 2.90 /  (0.082 * 273)

n = 2.90 / 22.386

n = 0.130 mol

The relationship between moles and mass;

Mass = number of moles * Molar mass

Mass = 0.130 mol * 32 g/mol

Mass = 4.16 g

here is table 2-2:

country

percent of eligible voters that voted

rank

united states

44.9%

138

canada

60.1%

107

costa rica

84.6%

14

hungary

66.9%

82

japan

57.0%

118

egypt

27.7%

159

south africa

85.5%

10

ans is no, the data set cannot be plotted as a single circle graph

it's 3.2 on edge, i just took the test.