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Tcecarenko [31]
2 years ago
6

How many significant figures does 7,874.9640 s have? Submit Question

Chemistry
2 answers:
julia-pushkina [17]2 years ago
8 0

Answer:

8 significant figures

Explanation:

All numbers (that are not zero) are always significant. Because there is a zero at the end of the number after the decimal place, this makes this zero also significant. This zero is significant because it makes the number more precise. Therefore, all of the numbers in this number are significant.

Bond [772]2 years ago
4 0

Answer:

There are 8 sig figs

Explanation:

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What is the percent by volume of a solution formed by mixing 15 mL of hydrochloric acid into water, forming 75 mL of solution?
timama [110]

Answer:

= 17% (v/v)  

Explanation:

% by Volume = (Volume HCl / Volume of Solution)100%

= 15ml/(75ml + 15ml) x 100% = 16.66666667% (calculator answer)

= 17% (v/v)  2 sig figs. based on volume values given.

4 0
3 years ago
How many atoms are in 25.0 moles of calcium (Ca)?
arsen [322]

Answer:

1.8066e+24 is the answer

3 0
3 years ago
What is the mass in grams of 14.2 liters of sulfur dioxide gas at STP?
ICE Princess25 [194]

Answer:

Mass = 40.4 g

Explanation:

Given data:

Mass in gram = ?

Volume of SO₂ = 14.2 L

Temperature = standard = 273 K

Pressure =  standard = 1 atm

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

1 atm × 14.2 L = n × 0.0821 atm.L/ mol.K   × 273 K

14.2 atm.L = n ×  22.41 atm.L/ mol

n = 14.2 atm.L/22.41 atm.L/ mol

n = 0.63 mol

Mass of sulfur dioxide:

Mass = number of moles × molar mass

Mass = 0.63 mol × 64.1 g/mol

Mass = 40.4 g

7 0
3 years ago
Classify each of the following as abiotic or biotic.
mars1129 [50]

Answer:

<h3>D. </h3>

Explanation:

<h3>#I'm not sure</h3><h3>#happy learning</h3>
7 0
2 years ago
Read 2 more answers
The reaction NA3PO4(aq) + 3 AgNO3(aq) → Ag3PO4() + 3NaNO 3( aq) is best classified as a(n)?
Natasha2012 [34]

Answer:

Double replacement reaction.

Explanation:

The Na and Ag atoms both (double) trade places (replacement) with each other.  

8 0
2 years ago
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