Use the molecular formula to find the molar mass; to obtain the number of moles, divide the mass of compound by the molar mass of the compound expressed in grams.

6 0

3 years ago

How many nitrogen atoms are there in 2.10 moles of nitrogen moles?

Korolek [52]

N=N/Na;
N=n×Na

$N = 2.10 \times 6.02 \times {10}^{23} = 1.2642 \times {10}^{23} \: atoms$

$N(N2) = 2 \times 1.2642 \times {10}^{23} = 2.5284 \times {10}^{24} molecules$
answer: a

8 0

3 years ago

Help please<br> How many grams in 7.57 moles of Calcium Nitrate (Ca(NO3)2)

vfiekz [6]

I believe it’s 164.0878 grams

5 0

3 years ago

A deuteron, 21H, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. The plasma of deuterons in a n

VikaD [51]

Answer:

$1.9 \times 10^{6}\text{ m/s}$

Explanation:

$v_{\text{rms}} = \sqrt{\dfrac{3RT}{M}$

Data:

T = 3.02 × 10⁸ K

M = 2.013 × 10⁻³ kg/mol

Calculation:

$v_{\text{rms}} = \sqrt{\dfrac{3\times 8.314\text{ J}\cdot\text{K}^{-1} \text{mol}^{-1} \times 3.02 \times 10^{8} \text{ K}}{2.014 \times 10^{-3} \text{ kg}\cdot \text{mol}^{-1}}}\\\\\\=\sqrt{3.740\times 10^{12} \text{ (m/s)}^{2}} = 1.9 \times 10^{6}\text{ m/s}$

5 0

3 years ago