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masya89 [10]
3 years ago
10

A sample of a substance has a mass of 4.2 grams and a volume of 6 milliliters. The density of this substance BLANK) ( grams/mill

iliter.
Chemistry
2 answers:
elena55 [62]3 years ago
3 0

0.7 my teacher just gave me the answer i got too lazy to explain why

kondor19780726 [428]3 years ago
3 0

Answer:- Density of the substance is 0.7\frac{g}{mL} .

Solution:- Density is directly proportional to mass and inversely proportional to volume. The density formula is:

d=\frac{M}{V}

where d stands for density, M stands for mass and V stands for volume.

Given mass is 4.2 grams and the volume is 6 mL. Let's plug in the values of mass and volume in the formula to calculate the density.

d=\frac{4.2g}{6mL}

d=0.7\frac{g}{mL}

So, the density of the substance is 0.7\frac{g}{mL} .

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Answer: 996 mmHg

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According to avogadro's law, 1 mole of every substance occupies 22.4 L at NTP, weighs equal to the molecular mass and contains avogadro's number 6.023\times 10^{23} of particles.

According to the ideal gas equation:

PV=nRT

P = Pressure of the gas = ?

V= Volume of the gas = 25.5 L

T= Temperature of the gas = 13°C = (273+13) K  = 286K

R= Gas constant = 0.0821 atmL/K mol

n=  moles of gas= 1.42

P=\frac{nRT}{V}=\frac{1.42\times 0.0821\times 286}{25.5}=1.31atm=996mmHg      (760mmHg=1atm)

Thus pressure of this gas sample is 996 mm Hg.

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