2. A 0.239 g sample of a gas in a 300-ml the gas? (4 pt)* xe reof 0.67 atm at 14

Question

2. A 0.239 g sample of a gas in a 300-ml the gas? (4 pt)* xe reof 0.67 atm at 14 °C, what is (A)h2 (b) ½ (c) Kr (d) Xe (e) 02 l04 22. 10,1 m L. 3. According to the equation SnO2(s) + 2H2 (g) ? Sn (s) + 2H:0 (1) 2 What volume of hydrogen, measured at STP, is required to react with 10.00g of SnO2 (MM-150.71 g/mol),? (4 pt)" 4. The specific heats of several metals are given in the below. If the same number of Joules were applied to the same mass of each metal, which metal would show the lowest temperature change? (3 pt) a) Al (b)u () Cu (d Hg (e) Fe 0 Specific Heat, J/g-c Al 0.900; Au 0.129; Cu 0.385; Hg 0.139; Fe 0.450

Explanation / Answer

(2)

Using ideal gas law:

PV = nRT

Putting values:

0.67*0.3 = n*0.0821*287

Solving we get:

n = 0.00853

So,

Molar mass of the gas = Mass/Moles = 0.239/0.00853 = 28 g

So the correct answer is (b) N2.

(4)

The element which has the highest value of specific heat capacity needs more energy for a unit rise in temperature.

This means that the element with the highest specfic heat will show smallest temperature change if a certain amount of heat is applied to it.

So the correct answer is (a) Al.

Hope this helps !

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